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Marvels-1 : a face-on double-lined binary star masquerading as a resonant planetary system and consideration of rare false positives in radial velocity planet searches

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Marvels-1 : a face-on double-lined binary star masquerading as a resonant planetary system and consideration of rare false positives in radial velocity planet searches

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Título Marvels-1 : a face-on double-lined binary star masquerading as a resonant planetary system and consideration of rare false positives in radial velocity planet searches
Autor Wright, Jason Thomas
Roy, Arpita
Mahadevan, Suvrath
Wang, Sharon Xuesong
Ford, Eric B.
Payne, Matthew John
Lee, Brian L.
Wang, Ji
Crepp, Justin R.
Gaudi, B. S.
Eastman, Jason
Pepper, J.
Ge, Jian
Fleming, S.W.
Ghezzi, Luan
González Hernández, Jonay I.
Cargile, Phillip A.
Stassun, Keivan G.
Wisniewski, J.P.
Ferreira, Letícia D.
Mello, Gustavo Frederico Porto de
Maia, Marcio Antonio Geimba
Costa, Luiz N. da
Ogando, Ricardo L.C.
Santiago, Basilio Xavier
Schneider, D.P.
Hearty, Frederick R.
Abstract We have analyzed new and previously published radial velocity (RV) observations of MARVELS-1, known to have an ostensibly substellar companion in a ∼6 day orbit. We find significant (∼100ms-ˡ) residuals to the best-fit model for the companion, and these residuals are naïvely consistent with an interior giant planet with a P = 1.965 days in a nearly perfect 3:1 period commensurability (|Pb/Pc − 3| < 10 −4). We have performed several tests for the reality of such a companion, including a dynamical analysis, a search for photometric variability, and a hunt for contaminating stellar spectra. We find many reasons to be critical of a planetary interpretation, including the fact that most of the three-body dynamical solutions are unstable. We find no evidence for transits, and no evidence of stellar photometric variability. We have discovered two apparent companions to MARVELS-1 with adaptive optics imaging at Keck; both are M dwarfs, one is likely bound, and the other is likely a foreground object. We explore false-alarm scenarios inspired by various curiosities in the data. Ultimately, a line profile and bisector analysis lead us to conclude that the ∼100 m s-ˡ residuals are an artifact of spectral contamination from a stellar companion contributing ∼15%–30% of the optical light in the system. We conclude that origin of this contamination is the previously detected RV companion to MARVELS-1, which is not, as previously reported, a brown dwarf, but in fact a G dwarf in a face-on orbit.
Contido em The astrophysical journal. Bristol. Vol. 770, no. 2 (June 2013), 119, 21 p.
Assunto Anãs marrons
Espectros estelares
Estrelas binarias
Fotometria estelar
Movimento estelar
Óptica adaptiva
[en] Binaries: spectroscopic
[en] Brown dwarfs
[en] Stars: individual (TYC 1240-945-1)
[en] Stars: low-mass
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/109076
Arquivos Descrição Formato
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