Unseen companions of V Hya inferred from periodic ejections
ABSTRACT A recent study using Hubble Space Telescope observations found periodic, high-speed, collimated ejections (or ‘bullets’) from the star V Hya. The authors of that study proposed a model associating these bullets with the periastron passage of an unseen, substellar companion in an eccentric o...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2019-08, Vol.487 (3), p.3029-3036 |
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creator | Salas, Jesus M Naoz, Smadar Morris, Mark R Stephan, Alexander P |
description | ABSTRACT
A recent study using Hubble Space Telescope observations found periodic, high-speed, collimated ejections (or ‘bullets’) from the star V Hya. The authors of that study proposed a model associating these bullets with the periastron passage of an unseen, substellar companion in an eccentric orbit and with an orbital period of ∼8 yr. Here we propose that V Hya is part of a triple system, with a substellar companion having an orbital period of ∼8 yr, and a tertiary object on a much wider orbit. In this model, the more distant object causes high-eccentricity excitations on the substellar companion’s orbit via the Eccentric Kozai–Lidov mechanism. These eccentricities can reach such high values that they lead to Roche-lobe crossing, producing the observed bullet ejections via a strongly enhanced accretion episode. For example, we find that a ballistic bullet ejection mechanism can be produced by a brown-dwarf-mass companion, while magnetically driven outflows are consistent with a Jovian-mass companion. Finally, we suggest that the distant companion may reside at few a hundred astronomical units on an eccentric orbit. |
doi_str_mv | 10.1093/mnras/stz1515 |
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A recent study using Hubble Space Telescope observations found periodic, high-speed, collimated ejections (or ‘bullets’) from the star V Hya. The authors of that study proposed a model associating these bullets with the periastron passage of an unseen, substellar companion in an eccentric orbit and with an orbital period of ∼8 yr. Here we propose that V Hya is part of a triple system, with a substellar companion having an orbital period of ∼8 yr, and a tertiary object on a much wider orbit. In this model, the more distant object causes high-eccentricity excitations on the substellar companion’s orbit via the Eccentric Kozai–Lidov mechanism. These eccentricities can reach such high values that they lead to Roche-lobe crossing, producing the observed bullet ejections via a strongly enhanced accretion episode. For example, we find that a ballistic bullet ejection mechanism can be produced by a brown-dwarf-mass companion, while magnetically driven outflows are consistent with a Jovian-mass companion. Finally, we suggest that the distant companion may reside at few a hundred astronomical units on an eccentric orbit.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stz1515</identifier><language>eng</language><publisher>Oxford University Press</publisher><ispartof>Monthly notices of the Royal Astronomical Society, 2019-08, Vol.487 (3), p.3029-3036</ispartof><rights>2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c309t-4764aeeab0e74dc759ff91e56b145416081b587f36623f54c84a00338227cc23</citedby><cites>FETCH-LOGICAL-c309t-4764aeeab0e74dc759ff91e56b145416081b587f36623f54c84a00338227cc23</cites><orcidid>0000-0002-9802-9279</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1598,27901,27902</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stz1515$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Salas, Jesus M</creatorcontrib><creatorcontrib>Naoz, Smadar</creatorcontrib><creatorcontrib>Morris, Mark R</creatorcontrib><creatorcontrib>Stephan, Alexander P</creatorcontrib><title>Unseen companions of V Hya inferred from periodic ejections</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
A recent study using Hubble Space Telescope observations found periodic, high-speed, collimated ejections (or ‘bullets’) from the star V Hya. The authors of that study proposed a model associating these bullets with the periastron passage of an unseen, substellar companion in an eccentric orbit and with an orbital period of ∼8 yr. Here we propose that V Hya is part of a triple system, with a substellar companion having an orbital period of ∼8 yr, and a tertiary object on a much wider orbit. In this model, the more distant object causes high-eccentricity excitations on the substellar companion’s orbit via the Eccentric Kozai–Lidov mechanism. These eccentricities can reach such high values that they lead to Roche-lobe crossing, producing the observed bullet ejections via a strongly enhanced accretion episode. For example, we find that a ballistic bullet ejection mechanism can be produced by a brown-dwarf-mass companion, while magnetically driven outflows are consistent with a Jovian-mass companion. Finally, we suggest that the distant companion may reside at few a hundred astronomical units on an eccentric orbit.</description><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFzz9PwzAQhnELgUQpjOweWUx9_puICVXQIlViKayR45ylVMSO7DCUT09LuzPd8tPpfQi5B_4IvJaLIWZXFmX6AQ36gsxAGs1EbcwlmXEuNasswDW5KWXHOVdSmBl5-ogFMVKfhtHFPsVCU6CfdL13tI8Bc8aOhpwGOmLuU9d7ijv001Hekqvgvgrene-cbF9ftss127yv3pbPG-YlryemrFEO0bUcreq81XUINaA2LSitwPAKWl3ZII0RMmjlK-UOc2UlhPVeyDlhp7c-p1IyhmbM_eDyvgHeHMObv_DmHH7wDyefvsd_6C_DkFrb</recordid><startdate>20190811</startdate><enddate>20190811</enddate><creator>Salas, Jesus M</creator><creator>Naoz, Smadar</creator><creator>Morris, Mark R</creator><creator>Stephan, Alexander P</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0002-9802-9279</orcidid></search><sort><creationdate>20190811</creationdate><title>Unseen companions of V Hya inferred from periodic ejections</title><author>Salas, Jesus M ; Naoz, Smadar ; Morris, Mark R ; Stephan, Alexander P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c309t-4764aeeab0e74dc759ff91e56b145416081b587f36623f54c84a00338227cc23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Salas, Jesus M</creatorcontrib><creatorcontrib>Naoz, Smadar</creatorcontrib><creatorcontrib>Morris, Mark R</creatorcontrib><creatorcontrib>Stephan, Alexander P</creatorcontrib><collection>CrossRef</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Salas, Jesus M</au><au>Naoz, Smadar</au><au>Morris, Mark R</au><au>Stephan, Alexander P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unseen companions of V Hya inferred from periodic ejections</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2019-08-11</date><risdate>2019</risdate><volume>487</volume><issue>3</issue><spage>3029</spage><epage>3036</epage><pages>3029-3036</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>ABSTRACT
A recent study using Hubble Space Telescope observations found periodic, high-speed, collimated ejections (or ‘bullets’) from the star V Hya. The authors of that study proposed a model associating these bullets with the periastron passage of an unseen, substellar companion in an eccentric orbit and with an orbital period of ∼8 yr. Here we propose that V Hya is part of a triple system, with a substellar companion having an orbital period of ∼8 yr, and a tertiary object on a much wider orbit. In this model, the more distant object causes high-eccentricity excitations on the substellar companion’s orbit via the Eccentric Kozai–Lidov mechanism. These eccentricities can reach such high values that they lead to Roche-lobe crossing, producing the observed bullet ejections via a strongly enhanced accretion episode. For example, we find that a ballistic bullet ejection mechanism can be produced by a brown-dwarf-mass companion, while magnetically driven outflows are consistent with a Jovian-mass companion. Finally, we suggest that the distant companion may reside at few a hundred astronomical units on an eccentric orbit.</abstract><pub>Oxford University Press</pub><doi>10.1093/mnras/stz1515</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-9802-9279</orcidid><oa>free_for_read</oa></addata></record> |
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title | Unseen companions of V Hya inferred from periodic ejections |
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