A Hot Saturn Near (but Unassociated with) the Open Cluster NGC 1817
We report on the discovery of a hot Saturn-sized planet (9.916 0.985 R⊕) around a late F-star, K2-308, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member ( membership probability...
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| Veröffentlicht in: | The Astronomical journal 2019-08, Vol.158 (2), p.62 |
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| creator | Rampalli, Rayna Vanderburg, Andrew Bieryla, Allyson Latham, David W. Quinn, Samuel N. Baranec, Christoph Berlind, Perry Calkins, Michael L. Cochran, William D. Duev, Dmitry A. Endl, Michael Esquerdo, Gilbert A. Jensen-Clem, Rebecca Law, Nicholas M. Mayo, Andrew W. Riddle, Reed Salama, Maïssa |
| description | We report on the discovery of a hot Saturn-sized planet (9.916 0.985 R⊕) around a late F-star, K2-308, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member ( membership probability) of the open cluster NGC 1817 based on its kinematics and photometric distance. We identify the host star (among three stars within the K2 photometric aperture) using seeing-limited photometry and rule out false-positive scenarios using adaptive optics imaging and radial velocity observations. We statistically validate K2-308b by calculating a false-positive probability rate of . However, we also show using new kinematic measurements provided by Gaia DR2 and our measured radial velocity of the system that K2-308 is unassociated with the cluster NGC 1817. Therefore, the long running search for a giant transiting planet in an open cluster remains fruitless. Finally, we note that our use of seeing-limited photometry is a good demonstration of similar techniques that are already being used to follow up Transiting Exoplanet Survey Satellite (TESS) planet candidates, especially in crowded regions. |
| doi_str_mv | 10.3847/1538-3881/ab27c2 |
| format | Article |
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We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member ( membership probability) of the open cluster NGC 1817 based on its kinematics and photometric distance. We identify the host star (among three stars within the K2 photometric aperture) using seeing-limited photometry and rule out false-positive scenarios using adaptive optics imaging and radial velocity observations. We statistically validate K2-308b by calculating a false-positive probability rate of . However, we also show using new kinematic measurements provided by Gaia DR2 and our measured radial velocity of the system that K2-308 is unassociated with the cluster NGC 1817. Therefore, the long running search for a giant transiting planet in an open cluster remains fruitless. Finally, we note that our use of seeing-limited photometry is a good demonstration of similar techniques that are already being used to follow up Transiting Exoplanet Survey Satellite (TESS) planet candidates, especially in crowded regions.</description><identifier>ISSN: 0004-6256</identifier><identifier>EISSN: 1538-3881</identifier><identifier>DOI: 10.3847/1538-3881/ab27c2</identifier><language>eng</language><publisher>Madison: The American Astronomical Society</publisher><subject>Adaptive optics ; Apertures ; Astronomy ; Clusters ; Extrasolar planets ; F stars ; Kinematics ; Optics ; Photometry ; Planet detection ; planetary systems ; planets and satellites: detection ; Radial velocity ; Saturn ; stars: individual (K2-308) ; Transit</subject><ispartof>The Astronomical journal, 2019-08, Vol.158 (2), p.62</ispartof><rights>2019. The American Astronomical Society. 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J</addtitle><description>We report on the discovery of a hot Saturn-sized planet (9.916 0.985 R⊕) around a late F-star, K2-308, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member ( membership probability) of the open cluster NGC 1817 based on its kinematics and photometric distance. We identify the host star (among three stars within the K2 photometric aperture) using seeing-limited photometry and rule out false-positive scenarios using adaptive optics imaging and radial velocity observations. We statistically validate K2-308b by calculating a false-positive probability rate of . However, we also show using new kinematic measurements provided by Gaia DR2 and our measured radial velocity of the system that K2-308 is unassociated with the cluster NGC 1817. Therefore, the long running search for a giant transiting planet in an open cluster remains fruitless. 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J</addtitle><date>2019-08-01</date><risdate>2019</risdate><volume>158</volume><issue>2</issue><spage>62</spage><pages>62-</pages><issn>0004-6256</issn><eissn>1538-3881</eissn><abstract>We report on the discovery of a hot Saturn-sized planet (9.916 0.985 R⊕) around a late F-star, K2-308, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member ( membership probability) of the open cluster NGC 1817 based on its kinematics and photometric distance. We identify the host star (among three stars within the K2 photometric aperture) using seeing-limited photometry and rule out false-positive scenarios using adaptive optics imaging and radial velocity observations. We statistically validate K2-308b by calculating a false-positive probability rate of . However, we also show using new kinematic measurements provided by Gaia DR2 and our measured radial velocity of the system that K2-308 is unassociated with the cluster NGC 1817. Therefore, the long running search for a giant transiting planet in an open cluster remains fruitless. 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| subjects | Adaptive optics Apertures Astronomy Clusters Extrasolar planets F stars Kinematics Optics Photometry Planet detection planetary systems planets and satellites: detection Radial velocity Saturn stars: individual (K2-308) Transit |
| title | A Hot Saturn Near (but Unassociated with) the Open Cluster NGC 1817 |
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