The Initial Mass Function Based on the Full-sky 20-pc Census of \(\sim\)3,600 Stars and Brown Dwarfs

The Initial Mass Function Based on the Full-sky 20-pc Census of \(\sim\)3,600 Stars and Brown Dwarfs

A complete accounting of nearby objects -- from the highest-mass white dwarf progenitors down to low-mass brown dwarfs -- is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based surveys, and Spitzer follow-up. We create a census of objects w...

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Veröffentlicht in:arXiv.org 2023-12
Hauptverfasser: J Davy Kirkpatrick, Marocco, Federico, Gelino, Christopher R, Yadukrishna Raghu, Faherty, Jacqueline K, Daniella C Bardalez Gagliuffi, Schurr, Steven D, Apps, Kevin, Schneider, Adam C, Meisner, Aaron M, Kuchner, Marc J, Caselden, Dan, Smart, R L, Casewell, S L, Raddi, Roberto, Kesseli, Aurora, Nikolaj Stevnbak Andersen, Antonini, Edoardo, Beaulieu, Paul, Bickle, Thomas P, Bilsing, Martin, Chieng, Raymond, Guillaume, Colin, Deen, Sam, Dereveanco, Alexandru, Doll, Katharina, Durantini Luca, Hugo A, Frazer, Anya, Gantier, Jean Marc, Gramaize, Léopold, Grant, Kristin, Hamlet, Leslie K, Higashimura, Hiro, Hyogo, Michiharu, Jałowiczor, Peter A, Jonkeren, Alexander, Kabatnik, Martin, Kiwy, Frank, Martin, David W, Michaels, Marianne N, Pendrill, William, Celso Pessanha Machado, Pumphrey, Benjamin, Rothermich, Austin, Russwurm, Rebekah, Sainio, Arttu, Sanchez, John, Sapelkin-Tambling, Fyodor Theo, Schümann, Jörg, Selg-Mann, Karl, Singh, Harshdeep, Stenner, Andres, Sun, Guoyou, Tanner, Christopher, Thévenot, Melina, Ventura, Maurizio, Voloshin, Nikita V, Walla, Jim, Wedracki, Zbigniew, Adorno, Jose I, Aganze, Christian, Allers, Katelyn N, Brooks, Hunter, Burgasser, Adam J, Calamari, Emily, Connor, Thomas, Costa, Edgardo, Eisenhardt, Peter R, Gagné, Jonathan, Gerasimov, Roman, Gonzales, Eileen C, Hsu, Chih-Chun, Kiman, Rocio, Li, Guodong, Low, Ryan, Mamajek, Eric, Pantoja, Blake M, Popinchalk, Mark, Rees, Jon M, Stern, Daniel, Suárez, Genaro, Theissen, Christopher, Chao-Wei, Tsai, Vos, Johanna M, Zurek, David, The Backyard Worlds, Planet 9 Collaboration
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Sprache:eng
Schlagworte:
Binary stars
Brown dwarf stars
Census
Censuses
Initial mass function
Low mass stars
Parallax
Star & galaxy formation
Star formation
White dwarf stars
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container_title arXiv.org
container_volume
creator J Davy Kirkpatrick
Marocco, Federico
Gelino, Christopher R
Yadukrishna Raghu
Faherty, Jacqueline K
Daniella C Bardalez Gagliuffi
Schurr, Steven D
Apps, Kevin
Schneider, Adam C
Meisner, Aaron M
Kuchner, Marc J
Caselden, Dan
Smart, R L
Casewell, S L
Raddi, Roberto
Kesseli, Aurora
Nikolaj Stevnbak Andersen
Antonini, Edoardo
Beaulieu, Paul
Bickle, Thomas P
Bilsing, Martin
Chieng, Raymond
Guillaume, Colin
Deen, Sam
Dereveanco, Alexandru
Doll, Katharina
Durantini Luca, Hugo A
Frazer, Anya
Gantier, Jean Marc
Gramaize, Léopold
Grant, Kristin
Hamlet, Leslie K
Higashimura, Hiro
Hyogo, Michiharu
Jałowiczor, Peter A
Jonkeren, Alexander
Kabatnik, Martin
Kiwy, Frank
Martin, David W
Michaels, Marianne N
Pendrill, William
Celso Pessanha Machado
Pumphrey, Benjamin
Rothermich, Austin
Russwurm, Rebekah
Sainio, Arttu
Sanchez, John
Sapelkin-Tambling, Fyodor Theo
Schümann, Jörg
Selg-Mann, Karl
Singh, Harshdeep
Stenner, Andres
Sun, Guoyou
Tanner, Christopher
Thévenot, Melina
Ventura, Maurizio
Voloshin, Nikita V
Walla, Jim
Wedracki, Zbigniew
Adorno, Jose I
Aganze, Christian
Allers, Katelyn N
Brooks, Hunter
Burgasser, Adam J
Calamari, Emily
Connor, Thomas
Costa, Edgardo
Eisenhardt, Peter R
Gagné, Jonathan
Gerasimov, Roman
Gonzales, Eileen C
Hsu, Chih-Chun
Kiman, Rocio
Li, Guodong
Low, Ryan
Mamajek, Eric
Pantoja, Blake M
Popinchalk, Mark
Rees, Jon M
Stern, Daniel
Suárez, Genaro
Theissen, Christopher
Chao-Wei, Tsai
Vos, Johanna M
Zurek, David
The Backyard Worlds
Planet 9 Collaboration
description A complete accounting of nearby objects -- from the highest-mass white dwarf progenitors down to low-mass brown dwarfs -- is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based surveys, and Spitzer follow-up. We create a census of objects within a Sun-centered sphere of 20-pc radius and check published literature to decompose each binary or higher-order system into its separate components. The result is a volume-limited census of \(\sim\)3,600 individual star formation products useful in measuring the initial mass function across the stellar (\(
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We create a census of objects within a Sun-centered sphere of 20-pc radius and check published literature to decompose each binary or higher-order system into its separate components. The result is a volume-limited census of \(\sim\)3,600 individual star formation products useful in measuring the initial mass function across the stellar (\(<8 M_\odot\)) and substellar (\(\gtrsim 5 M_{Jup}\)) regimes. Comparing our resulting initial mass function to previous measurements shows good agreement above 0.8\(M_\odot\) and a divergence at lower masses. Our 20-pc space densities are best fit with a quadripartite power law, \(\xi(M) = dN/dM \propto M^{-\alpha}\) with long-established values of \(\alpha = 2.3\) at high masses (\(0.55 < M < 8.00 M_\odot\)) and \(\alpha = 1.3\) at intermediate masses (\(0.22 < M < 0.55 M_\odot\)), but at lower masses we find \(\alpha = 0.25\) for \(0.05 < M <0.22 M_\odot\) and \(\alpha = 0.6\) for \(0.01 < M < 0.05 M_\odot\). This implies that the rate of production as a function of decreasing mass diminishes in the low-mass star/high-mass brown dwarf regime before increasing again in the low-mass brown dwarf regime. Correcting for completeness, we find a star to brown dwarf number ratio of, currently, 4:1, and an average mass per object of 0.41 \(M_\odot\).]]></description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Binary stars ; Brown dwarf stars ; Census ; Censuses ; Initial mass function ; Low mass stars ; Parallax ; Star &amp; galaxy formation ; Star formation ; White dwarf stars</subject><ispartof>arXiv.org, 2023-12</ispartof><rights>2023. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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Kristin</creatorcontrib><creatorcontrib>Hamlet, Leslie K</creatorcontrib><creatorcontrib>Higashimura, Hiro</creatorcontrib><creatorcontrib>Hyogo, Michiharu</creatorcontrib><creatorcontrib>Jałowiczor, Peter A</creatorcontrib><creatorcontrib>Jonkeren, Alexander</creatorcontrib><creatorcontrib>Kabatnik, Martin</creatorcontrib><creatorcontrib>Kiwy, Frank</creatorcontrib><creatorcontrib>Martin, David W</creatorcontrib><creatorcontrib>Michaels, Marianne N</creatorcontrib><creatorcontrib>Pendrill, William</creatorcontrib><creatorcontrib>Celso Pessanha Machado</creatorcontrib><creatorcontrib>Pumphrey, Benjamin</creatorcontrib><creatorcontrib>Rothermich, Austin</creatorcontrib><creatorcontrib>Russwurm, Rebekah</creatorcontrib><creatorcontrib>Sainio, Arttu</creatorcontrib><creatorcontrib>Sanchez, John</creatorcontrib><creatorcontrib>Sapelkin-Tambling, Fyodor Theo</creatorcontrib><creatorcontrib>Schümann, Jörg</creatorcontrib><creatorcontrib>Selg-Mann, Karl</creatorcontrib><creatorcontrib>Singh, Harshdeep</creatorcontrib><creatorcontrib>Stenner, Andres</creatorcontrib><creatorcontrib>Sun, Guoyou</creatorcontrib><creatorcontrib>Tanner, Christopher</creatorcontrib><creatorcontrib>Thévenot, Melina</creatorcontrib><creatorcontrib>Ventura, Maurizio</creatorcontrib><creatorcontrib>Voloshin, Nikita V</creatorcontrib><creatorcontrib>Walla, Jim</creatorcontrib><creatorcontrib>Wedracki, Zbigniew</creatorcontrib><creatorcontrib>Adorno, Jose I</creatorcontrib><creatorcontrib>Aganze, Christian</creatorcontrib><creatorcontrib>Allers, Katelyn N</creatorcontrib><creatorcontrib>Brooks, Hunter</creatorcontrib><creatorcontrib>Burgasser, Adam J</creatorcontrib><creatorcontrib>Calamari, Emily</creatorcontrib><creatorcontrib>Connor, Thomas</creatorcontrib><creatorcontrib>Costa, Edgardo</creatorcontrib><creatorcontrib>Eisenhardt, Peter R</creatorcontrib><creatorcontrib>Gagné, Jonathan</creatorcontrib><creatorcontrib>Gerasimov, Roman</creatorcontrib><creatorcontrib>Gonzales, Eileen C</creatorcontrib><creatorcontrib>Hsu, Chih-Chun</creatorcontrib><creatorcontrib>Kiman, Rocio</creatorcontrib><creatorcontrib>Li, Guodong</creatorcontrib><creatorcontrib>Low, Ryan</creatorcontrib><creatorcontrib>Mamajek, Eric</creatorcontrib><creatorcontrib>Pantoja, Blake M</creatorcontrib><creatorcontrib>Popinchalk, Mark</creatorcontrib><creatorcontrib>Rees, Jon M</creatorcontrib><creatorcontrib>Stern, Daniel</creatorcontrib><creatorcontrib>Suárez, Genaro</creatorcontrib><creatorcontrib>Theissen, Christopher</creatorcontrib><creatorcontrib>Chao-Wei, Tsai</creatorcontrib><creatorcontrib>Vos, Johanna M</creatorcontrib><creatorcontrib>Zurek, David</creatorcontrib><creatorcontrib>The Backyard Worlds</creatorcontrib><creatorcontrib>Planet 9 Collaboration</creatorcontrib><title>The Initial Mass Function Based on the Full-sky 20-pc Census of \(\sim\)3,600 Stars and Brown Dwarfs</title><title>arXiv.org</title><description><![CDATA[A complete accounting of nearby objects -- from the highest-mass white dwarf progenitors down to low-mass brown dwarfs -- is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based surveys, and Spitzer follow-up. We create a census of objects within a Sun-centered sphere of 20-pc radius and check published literature to decompose each binary or higher-order system into its separate components. The result is a volume-limited census of \(\sim\)3,600 individual star formation products useful in measuring the initial mass function across the stellar (\(<8 M_\odot\)) and substellar (\(\gtrsim 5 M_{Jup}\)) regimes. Comparing our resulting initial mass function to previous measurements shows good agreement above 0.8\(M_\odot\) and a divergence at lower masses. Our 20-pc space densities are best fit with a quadripartite power law, \(\xi(M) = dN/dM \propto M^{-\alpha}\) with long-established values of \(\alpha = 2.3\) at high masses (\(0.55 < M < 8.00 M_\odot\)) and \(\alpha = 1.3\) at intermediate masses (\(0.22 < M < 0.55 M_\odot\)), but at lower masses we find \(\alpha = 0.25\) for \(0.05 < M <0.22 M_\odot\) and \(\alpha = 0.6\) for \(0.01 < M < 0.05 M_\odot\). This implies that the rate of production as a function of decreasing mass diminishes in the low-mass star/high-mass brown dwarf regime before increasing again in the low-mass brown dwarf regime. Correcting for completeness, we find a star to brown dwarf number ratio of, currently, 4:1, and an average mass per object of 0.41 \(M_\odot\).]]></description><subject>Binary stars</subject><subject>Brown dwarf stars</subject><subject>Census</subject><subject>Censuses</subject><subject>Initial mass function</subject><subject>Low mass stars</subject><subject>Parallax</subject><subject>Star &amp; galaxy formation</subject><subject>Star formation</subject><subject>White dwarf stars</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNqNir0KwjAYAIMgKNp3-MBFwUKa2Nqu_hQdnHQsSGhTTI2J5ksQ394OPoDTHdwNyJhxnsT5irERiRA7SinL1ixN-Zg0l5uEo1FeCQ0ngQhlMLVX1sBGoGygF98vZdA6xvsHGI2fNWylwYBgW6jmFapHteDLjFI4e-EQhGlg4-zbwO4tXItTMmyFRhn9OCGzcn_ZHuKns68g0V87G5zp05XlRcGKNEkK_t_1BUu9Qwo</recordid><startdate>20231206</startdate><enddate>20231206</enddate><creator>J Davy Kirkpatrick</creator><creator>Marocco, Federico</creator><creator>Gelino, Christopher R</creator><creator>Yadukrishna Raghu</creator><creator>Faherty, Jacqueline K</creator><creator>Daniella C Bardalez Gagliuffi</creator><creator>Schurr, Steven D</creator><creator>Apps, Kevin</creator><creator>Schneider, Adam C</creator><creator>Meisner, Aaron M</creator><creator>Kuchner, Marc J</creator><creator>Caselden, Dan</creator><creator>Smart, R L</creator><creator>Casewell, S L</creator><creator>Raddi, Roberto</creator><creator>Kesseli, Aurora</creator><creator>Nikolaj Stevnbak Andersen</creator><creator>Antonini, Edoardo</creator><creator>Beaulieu, Paul</creator><creator>Bickle, Thomas P</creator><creator>Bilsing, Martin</creator><creator>Chieng, Raymond</creator><creator>Guillaume, Colin</creator><creator>Deen, Sam</creator><creator>Dereveanco, Alexandru</creator><creator>Doll, Katharina</creator><creator>Durantini Luca, Hugo A</creator><creator>Frazer, Anya</creator><creator>Gantier, Jean Marc</creator><creator>Gramaize, Léopold</creator><creator>Grant, Kristin</creator><creator>Hamlet, Leslie K</creator><creator>Higashimura, Hiro</creator><creator>Hyogo, Michiharu</creator><creator>Jałowiczor, Peter A</creator><creator>Jonkeren, Alexander</creator><creator>Kabatnik, Martin</creator><creator>Kiwy, Frank</creator><creator>Martin, David W</creator><creator>Michaels, Marianne N</creator><creator>Pendrill, William</creator><creator>Celso Pessanha Machado</creator><creator>Pumphrey, Benjamin</creator><creator>Rothermich, Austin</creator><creator>Russwurm, Rebekah</creator><creator>Sainio, Arttu</creator><creator>Sanchez, John</creator><creator>Sapelkin-Tambling, Fyodor Theo</creator><creator>Schümann, Jörg</creator><creator>Selg-Mann, Karl</creator><creator>Singh, Harshdeep</creator><creator>Stenner, Andres</creator><creator>Sun, Guoyou</creator><creator>Tanner, Christopher</creator><creator>Thévenot, Melina</creator><creator>Ventura, Maurizio</creator><creator>Voloshin, Nikita V</creator><creator>Walla, Jim</creator><creator>Wedracki, Zbigniew</creator><creator>Adorno, Jose I</creator><creator>Aganze, Christian</creator><creator>Allers, Katelyn N</creator><creator>Brooks, Hunter</creator><creator>Burgasser, Adam J</creator><creator>Calamari, Emily</creator><creator>Connor, Thomas</creator><creator>Costa, Edgardo</creator><creator>Eisenhardt, Peter R</creator><creator>Gagné, Jonathan</creator><creator>Gerasimov, Roman</creator><creator>Gonzales, Eileen C</creator><creator>Hsu, Chih-Chun</creator><creator>Kiman, Rocio</creator><creator>Li, Guodong</creator><creator>Low, Ryan</creator><creator>Mamajek, Eric</creator><creator>Pantoja, Blake M</creator><creator>Popinchalk, Mark</creator><creator>Rees, Jon M</creator><creator>Stern, Daniel</creator><creator>Suárez, Genaro</creator><creator>Theissen, Christopher</creator><creator>Chao-Wei, Tsai</creator><creator>Vos, Johanna M</creator><creator>Zurek, David</creator><creator>The Backyard Worlds</creator><creator>Planet 9 Collaboration</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20231206</creationdate><title>The Initial Mass Function Based on the Full-sky 20-pc Census of \(\sim\)3,600 Stars and Brown Dwarfs</title><author>J Davy Kirkpatrick ; Marocco, Federico ; Gelino, Christopher R ; Yadukrishna Raghu ; Faherty, Jacqueline K ; Daniella C Bardalez Gagliuffi ; Schurr, Steven D ; Apps, Kevin ; Schneider, Adam C ; Meisner, Aaron M ; Kuchner, Marc J ; Caselden, Dan ; Smart, R L ; Casewell, S L ; Raddi, Roberto ; Kesseli, Aurora ; Nikolaj Stevnbak Andersen ; Antonini, Edoardo ; Beaulieu, Paul ; Bickle, Thomas P ; Bilsing, Martin ; Chieng, Raymond ; Guillaume, Colin ; Deen, Sam ; Dereveanco, Alexandru ; Doll, Katharina ; Durantini Luca, Hugo A ; Frazer, Anya ; Gantier, Jean Marc ; Gramaize, Léopold ; Grant, Kristin ; Hamlet, Leslie K ; Higashimura, Hiro ; Hyogo, Michiharu ; Jałowiczor, Peter A ; Jonkeren, Alexander ; Kabatnik, Martin ; Kiwy, Frank ; Martin, David W ; Michaels, Marianne N ; Pendrill, William ; Celso Pessanha Machado ; Pumphrey, Benjamin ; Rothermich, Austin ; Russwurm, Rebekah ; Sainio, Arttu ; Sanchez, John ; Sapelkin-Tambling, Fyodor Theo ; Schümann, Jörg ; Selg-Mann, Karl ; Singh, Harshdeep ; Stenner, Andres ; Sun, Guoyou ; Tanner, Christopher ; Thévenot, Melina ; Ventura, Maurizio ; Voloshin, Nikita V ; Walla, Jim ; Wedracki, Zbigniew ; Adorno, Jose I ; Aganze, Christian ; Allers, Katelyn N ; Brooks, Hunter ; Burgasser, Adam J ; Calamari, Emily ; Connor, Thomas ; Costa, Edgardo ; Eisenhardt, Peter R ; Gagné, Jonathan ; Gerasimov, Roman ; Gonzales, Eileen C ; Hsu, Chih-Chun ; Kiman, Rocio ; Li, Guodong ; Low, Ryan ; Mamajek, Eric ; Pantoja, Blake M ; Popinchalk, Mark ; Rees, Jon M ; Stern, Daniel ; Suárez, Genaro ; Theissen, Christopher ; Chao-Wei, Tsai ; Vos, Johanna M ; Zurek, David ; The Backyard Worlds ; Planet 9 Collaboration</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_journals_28992951193</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Binary stars</topic><topic>Brown dwarf stars</topic><topic>Census</topic><topic>Censuses</topic><topic>Initial mass function</topic><topic>Low mass stars</topic><topic>Parallax</topic><topic>Star &amp; galaxy formation</topic><topic>Star formation</topic><topic>White dwarf stars</topic><toplevel>online_resources</toplevel><creatorcontrib>J Davy Kirkpatrick</creatorcontrib><creatorcontrib>Marocco, Federico</creatorcontrib><creatorcontrib>Gelino, Christopher R</creatorcontrib><creatorcontrib>Yadukrishna Raghu</creatorcontrib><creatorcontrib>Faherty, Jacqueline K</creatorcontrib><creatorcontrib>Daniella C Bardalez Gagliuffi</creatorcontrib><creatorcontrib>Schurr, Steven D</creatorcontrib><creatorcontrib>Apps, Kevin</creatorcontrib><creatorcontrib>Schneider, Adam C</creatorcontrib><creatorcontrib>Meisner, Aaron M</creatorcontrib><creatorcontrib>Kuchner, Marc J</creatorcontrib><creatorcontrib>Caselden, Dan</creatorcontrib><creatorcontrib>Smart, R L</creatorcontrib><creatorcontrib>Casewell, S L</creatorcontrib><creatorcontrib>Raddi, Roberto</creatorcontrib><creatorcontrib>Kesseli, Aurora</creatorcontrib><creatorcontrib>Nikolaj Stevnbak Andersen</creatorcontrib><creatorcontrib>Antonini, Edoardo</creatorcontrib><creatorcontrib>Beaulieu, Paul</creatorcontrib><creatorcontrib>Bickle, Thomas P</creatorcontrib><creatorcontrib>Bilsing, Martin</creatorcontrib><creatorcontrib>Chieng, Raymond</creatorcontrib><creatorcontrib>Guillaume, Colin</creatorcontrib><creatorcontrib>Deen, Sam</creatorcontrib><creatorcontrib>Dereveanco, Alexandru</creatorcontrib><creatorcontrib>Doll, Katharina</creatorcontrib><creatorcontrib>Durantini Luca, Hugo A</creatorcontrib><creatorcontrib>Frazer, Anya</creatorcontrib><creatorcontrib>Gantier, Jean Marc</creatorcontrib><creatorcontrib>Gramaize, Léopold</creatorcontrib><creatorcontrib>Grant, Kristin</creatorcontrib><creatorcontrib>Hamlet, Leslie K</creatorcontrib><creatorcontrib>Higashimura, Hiro</creatorcontrib><creatorcontrib>Hyogo, Michiharu</creatorcontrib><creatorcontrib>Jałowiczor, Peter A</creatorcontrib><creatorcontrib>Jonkeren, Alexander</creatorcontrib><creatorcontrib>Kabatnik, Martin</creatorcontrib><creatorcontrib>Kiwy, Frank</creatorcontrib><creatorcontrib>Martin, David W</creatorcontrib><creatorcontrib>Michaels, Marianne N</creatorcontrib><creatorcontrib>Pendrill, William</creatorcontrib><creatorcontrib>Celso Pessanha Machado</creatorcontrib><creatorcontrib>Pumphrey, Benjamin</creatorcontrib><creatorcontrib>Rothermich, Austin</creatorcontrib><creatorcontrib>Russwurm, Rebekah</creatorcontrib><creatorcontrib>Sainio, Arttu</creatorcontrib><creatorcontrib>Sanchez, John</creatorcontrib><creatorcontrib>Sapelkin-Tambling, Fyodor Theo</creatorcontrib><creatorcontrib>Schümann, Jörg</creatorcontrib><creatorcontrib>Selg-Mann, Karl</creatorcontrib><creatorcontrib>Singh, Harshdeep</creatorcontrib><creatorcontrib>Stenner, Andres</creatorcontrib><creatorcontrib>Sun, Guoyou</creatorcontrib><creatorcontrib>Tanner, Christopher</creatorcontrib><creatorcontrib>Thévenot, Melina</creatorcontrib><creatorcontrib>Ventura, Maurizio</creatorcontrib><creatorcontrib>Voloshin, Nikita V</creatorcontrib><creatorcontrib>Walla, Jim</creatorcontrib><creatorcontrib>Wedracki, Zbigniew</creatorcontrib><creatorcontrib>Adorno, Jose I</creatorcontrib><creatorcontrib>Aganze, Christian</creatorcontrib><creatorcontrib>Allers, Katelyn N</creatorcontrib><creatorcontrib>Brooks, Hunter</creatorcontrib><creatorcontrib>Burgasser, Adam J</creatorcontrib><creatorcontrib>Calamari, Emily</creatorcontrib><creatorcontrib>Connor, Thomas</creatorcontrib><creatorcontrib>Costa, Edgardo</creatorcontrib><creatorcontrib>Eisenhardt, Peter R</creatorcontrib><creatorcontrib>Gagné, Jonathan</creatorcontrib><creatorcontrib>Gerasimov, Roman</creatorcontrib><creatorcontrib>Gonzales, Eileen C</creatorcontrib><creatorcontrib>Hsu, Chih-Chun</creatorcontrib><creatorcontrib>Kiman, Rocio</creatorcontrib><creatorcontrib>Li, Guodong</creatorcontrib><creatorcontrib>Low, Ryan</creatorcontrib><creatorcontrib>Mamajek, Eric</creatorcontrib><creatorcontrib>Pantoja, Blake M</creatorcontrib><creatorcontrib>Popinchalk, Mark</creatorcontrib><creatorcontrib>Rees, Jon M</creatorcontrib><creatorcontrib>Stern, Daniel</creatorcontrib><creatorcontrib>Suárez, Genaro</creatorcontrib><creatorcontrib>Theissen, Christopher</creatorcontrib><creatorcontrib>Chao-Wei, Tsai</creatorcontrib><creatorcontrib>Vos, Johanna M</creatorcontrib><creatorcontrib>Zurek, David</creatorcontrib><creatorcontrib>The Backyard Worlds</creatorcontrib><creatorcontrib>Planet 9 Collaboration</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science &amp; Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>J Davy Kirkpatrick</au><au>Marocco, Federico</au><au>Gelino, Christopher R</au><au>Yadukrishna Raghu</au><au>Faherty, Jacqueline K</au><au>Daniella C Bardalez Gagliuffi</au><au>Schurr, Steven D</au><au>Apps, Kevin</au><au>Schneider, Adam C</au><au>Meisner, Aaron M</au><au>Kuchner, Marc J</au><au>Caselden, Dan</au><au>Smart, R L</au><au>Casewell, S L</au><au>Raddi, Roberto</au><au>Kesseli, Aurora</au><au>Nikolaj Stevnbak Andersen</au><au>Antonini, Edoardo</au><au>Beaulieu, Paul</au><au>Bickle, Thomas P</au><au>Bilsing, Martin</au><au>Chieng, Raymond</au><au>Guillaume, Colin</au><au>Deen, Sam</au><au>Dereveanco, Alexandru</au><au>Doll, Katharina</au><au>Durantini Luca, Hugo A</au><au>Frazer, Anya</au><au>Gantier, Jean Marc</au><au>Gramaize, Léopold</au><au>Grant, Kristin</au><au>Hamlet, Leslie K</au><au>Higashimura, Hiro</au><au>Hyogo, Michiharu</au><au>Jałowiczor, Peter A</au><au>Jonkeren, Alexander</au><au>Kabatnik, Martin</au><au>Kiwy, Frank</au><au>Martin, David W</au><au>Michaels, Marianne N</au><au>Pendrill, William</au><au>Celso Pessanha Machado</au><au>Pumphrey, Benjamin</au><au>Rothermich, Austin</au><au>Russwurm, Rebekah</au><au>Sainio, Arttu</au><au>Sanchez, John</au><au>Sapelkin-Tambling, Fyodor Theo</au><au>Schümann, Jörg</au><au>Selg-Mann, Karl</au><au>Singh, Harshdeep</au><au>Stenner, Andres</au><au>Sun, Guoyou</au><au>Tanner, Christopher</au><au>Thévenot, Melina</au><au>Ventura, Maurizio</au><au>Voloshin, Nikita V</au><au>Walla, Jim</au><au>Wedracki, Zbigniew</au><au>Adorno, Jose I</au><au>Aganze, Christian</au><au>Allers, Katelyn N</au><au>Brooks, Hunter</au><au>Burgasser, Adam J</au><au>Calamari, Emily</au><au>Connor, Thomas</au><au>Costa, Edgardo</au><au>Eisenhardt, Peter R</au><au>Gagné, Jonathan</au><au>Gerasimov, Roman</au><au>Gonzales, Eileen C</au><au>Hsu, Chih-Chun</au><au>Kiman, Rocio</au><au>Li, Guodong</au><au>Low, Ryan</au><au>Mamajek, Eric</au><au>Pantoja, Blake M</au><au>Popinchalk, Mark</au><au>Rees, Jon M</au><au>Stern, Daniel</au><au>Suárez, Genaro</au><au>Theissen, Christopher</au><au>Chao-Wei, Tsai</au><au>Vos, Johanna M</au><au>Zurek, David</au><au>The Backyard Worlds</au><au>Planet 9 Collaboration</au><format>book</format><genre>document</genre><ristype>GEN</ristype><atitle>The Initial Mass Function Based on the Full-sky 20-pc Census of \(\sim\)3,600 Stars and Brown Dwarfs</atitle><jtitle>arXiv.org</jtitle><date>2023-12-06</date><risdate>2023</risdate><eissn>2331-8422</eissn><abstract><![CDATA[A complete accounting of nearby objects -- from the highest-mass white dwarf progenitors down to low-mass brown dwarfs -- is now possible, thanks to an almost complete set of trigonometric parallax determinations from Gaia, ground-based surveys, and Spitzer follow-up. We create a census of objects within a Sun-centered sphere of 20-pc radius and check published literature to decompose each binary or higher-order system into its separate components. The result is a volume-limited census of \(\sim\)3,600 individual star formation products useful in measuring the initial mass function across the stellar (\(<8 M_\odot\)) and substellar (\(\gtrsim 5 M_{Jup}\)) regimes. Comparing our resulting initial mass function to previous measurements shows good agreement above 0.8\(M_\odot\) and a divergence at lower masses. Our 20-pc space densities are best fit with a quadripartite power law, \(\xi(M) = dN/dM \propto M^{-\alpha}\) with long-established values of \(\alpha = 2.3\) at high masses (\(0.55 < M < 8.00 M_\odot\)) and \(\alpha = 1.3\) at intermediate masses (\(0.22 < M < 0.55 M_\odot\)), but at lower masses we find \(\alpha = 0.25\) for \(0.05 < M <0.22 M_\odot\) and \(\alpha = 0.6\) for \(0.01 < M < 0.05 M_\odot\). This implies that the rate of production as a function of decreasing mass diminishes in the low-mass star/high-mass brown dwarf regime before increasing again in the low-mass brown dwarf regime. Correcting for completeness, we find a star to brown dwarf number ratio of, currently, 4:1, and an average mass per object of 0.41 \(M_\odot\).]]></abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><oa>free_for_read</oa></addata></record>
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subjects Binary stars
Brown dwarf stars
Census
Censuses
Initial mass function
Low mass stars
Parallax
Star & galaxy formation
Star formation
White dwarf stars
title The Initial Mass Function Based on the Full-sky 20-pc Census of \(\sim\)3,600 Stars and Brown Dwarfs
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