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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 | Jason T. Wright
; Arpita Roy
; Suvrath Mahadevan
; Sharon X. Wang
; Eric B. Ford
; Matt Payne
; Brian L. Lee
; Ji Wang
; Justin R. Crepp
; B. Scott Gaudi
; Jason Eastman
; Joshua Pepper
; Jian Ge
; Scott W. Fleming
; Luan Ghezzi
; Jonay I. Gonzalez-Hernandez
; Phillip Cargile
; Keivan G. Stassun
; John Wisniewski
; Leticia Dutra-Ferreira
; Gustavo F. Porto de Mello
; Marcio A. G. Maia
; Luiz Nicolaci da Costa
; Ricardo L. C. Ogando
; Basilio X. Santiago
; Donald P. Schneider
; Fred R. Hearty
; | Date: |
Wed, 1 May 2013 20:09:57 GMT (1820kb) | Abstract: | We have analyzed new and previously published radial velocity observations of
MARVELS-1, known to have an ostensibly substellar companion in a ~6- day orbit.
We find significant (~100 m/s) residuals to the best-fit model for the
companion, and these residuals are naively consistent with an interior giant
planet with a P = 1.965d in a nearly perfect 3:1 period commensuribility
(|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 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 radial velocity companion to MARVELS-1, which is not, as
previously reported, a brown dwarf, but in fact a G dwarf in a face-on orbit. | Source: | arXiv, 1305.0280 | Services: | Forum | Review | PDF | Favorites |
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