Friends of hot Jupiters. III. An infrared spectroscopic search for low-mass stellar companions
Knutson, Heather A.
Muirhead, Philip S.
Crepp, Justin R.
Morton, Timothy D.
MetadataShow full item record
Citation (published version)Danielle Piskorz, Heather A. Knutson, Henry Ngo, Philip S. Muirhead, Konstantin Batygin, Justin R. Crepp, Sasha Hinkley, Timothy D. Morton. 2015. "Friends of hot Jupiters. III. An infrared spectroscopic search for low-mass stellar companions." Astrophysical Journal, v. 814, Issue 2, pp. 1-15.
Surveys of nearby field stars indicate that stellar binaries are common, yet little is known about the effects that these companions may have on planet formation and evolution. The Friends of Hot Jupiters project uses three complementary techniques to search for stellar companions to known planet-hosting stars: radial velocity monitoring, adaptive optics imaging, and near-infrared spectroscopy. In this paper, we examine high-resolution K band infrared spectra of fifty stars hosting gas giant planets on short-period orbits. We use spectral fitting to search for blended lines due to the presence of cool stellar companions in the spectra of our target stars, where we are sensitive to companions with temperatures between 3500 and 5000 K and projected separations less than 100 AU in most systems. We identify eight systems with candidate low-mass companions, including one companion that was independently detected in our AO imaging survey. For systems with radial velocity accelerations, a spectroscopic non-detection rules out scenarios involving a stellar companion in a high inclination orbit. We use these data to place an upper limit on the stellar binary fraction at small projected separations, and show that the observed population of candidate companions is consistent with that of field stars and also with the population of wide-separation companions detected in our previous AO survey. We find no evidence that spectroscopic stellar companions are preferentially located in systems with short-period gas giant planets on eccentric and/or misaligned orbits.
Rights© 2015. The American Astronomical Society. All rights reserved.
Showing items related by title, author, creator and subject.
Friends of hot Jupiters. II. No correspondence between hot-Jupiter spin-orbit misalignment and the incidence of directly imaged stellar companions Ngo, Henry; Hinkley, Sasha; Batygin, Konstantin; Knutson, Heather A.; Crepp, Justin R.; Bechter, Eric B.; Howard, Andrew W.; Johnson, John A.; Morton, Timothy D.; Muirhead, Philip S. (Institute of Physics Publishing Ltd, 2015-02-20)Multi-star systems are common, yet little is known about a stellar companion's influence on the formation and evolution of planetary systems. For instance, stellar companions may have facilitated the inward migration of ...
Nichols, J.D.; Wynn, G.A.; Goad, M.; Alexander, R.D.; Casewell, S.L.; Cowley, S.W.H.; Burleigh, M.R.; Clarke, J.T.; Bisikalo, D. (IOP PUBLISHING LTD, 2015-04-10)We present new observations of four closely spaced near-ultraviolet (NUV) transits of the hot Jupiter-like exoplanet WASP-12b using Hubble Space Telescope (HST)/Cosmic Origins Spectrograph (COS), significantly increasing ...
Veyette, Mark J.; Muirhead, Philip S. (IOP PUBLISHING LTD, 2018-08-20)The M dwarf stars are exciting targets for exoplanet investigations; however, their fundamental stellar properties are difficult to measure. Perhaps the most challenging property is stellar age. Once on the main sequence, ...