Details

Autor(en) / Beteiligte

• Schneider, Adam C.
• Meisner, Aaron M.
• Gagné, Jonathan
• Faherty, Jacqueline K.
• Marocco, Federico
• Burgasser, Adam J.
• Kirkpatrick, J. Davy
• Kuchner, Marc J.
• Gramaize, Léopold
• Rothermich, Austin
• Brooks, Hunter
• Vrba, Frederick J.
• Bardalez Gagliuffi, Daniella
• Caselden, Dan
• Cushing, Michael C.
• Gelino, Christopher R.
• Line, Michael R.
• Casewell, Sarah L.
• Debes, John H.
• Aganze, Christian
• Ayala, Andrew
• Gerasimov, Roman
• Gonzales, Eileen C.
• Hsu, Chih-Chun
• Kiman, Rocio
• Popinchalk, Mark
• Theissen, Christopher

Titel

Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project

Ist Teil von

• The Astrophysical journal, 2021-11, Vol.921 (2), p.140

Ort / Verlag

Goddard Space Flight Center: The American Astronomical Society

Erscheinungsjahr

2021

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Through the Backyard Worlds: Planet 9 citizen science project, we have identified a wide-separation (∼10', ∼9900 au projected) substellar companion to the nearby (∼17.5 pc), mid-M dwarf Ross 19. We have developed a new formalism for determining chance alignment probabilities based on the BANYAN Σ tool, and find a 100% probability that this is a physically associated pair. Through a detailed examination of Ross 19A, we find that the system is metal-poor ([Fe/H] = −0.40 ± 0.12) with an age of 7.2 (+3.8, -3.6) Gyr. Combining new and existing photometry and astrometry, we find that Ross 19B is one of the coldest known wide-separation companions, with a spectral type on the T/Y boundary, an effective temperature of 500 (+115, -100) K, and a mass in the range 15–40 M(Jup). This new, extremely cold benchmark companion is a compelling target for detailed characterization with future spectroscopic observations using facilities such as the Hubble Space Telescope or James Webb Space Telescope.