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Title:
Know the Star, Know the Planet. III. Discovery of Late-Type Companions to Two Exoplanet Host Stars
Authors:
Roberts, Lewis C., Jr.; Tokovinin, Andrei; Mason, Brian D.; Riddle, Reed L.; Hartkopf, William I.; Law, Nicholas M.; Baranec, Christoph
Affiliation:
AA(Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena CA 91109, USA ), AB(Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile 0000-0002-2084-0782), AC(U.S. Naval Observatory, 3450 Massachusetts Avenue, NW, Washington, DC 20392-5420, USA), AD(Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA), AE(U.S. Naval Observatory, 3450 Massachusetts Avenue, NW, Washington, DC 20392-5420, USA), AF(Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA), AG(Institute for Astronomy, University of Hawaií at Mānoa, Hilo, HI 96720-2700, USA)
Publication:
The Astronomical Journal, Volume 149, Issue 4, article id. 118, 7 pp. (2015). (AJ Homepage)
Publication Date:
04/2015
Origin:
IOP
Astronomy Keywords:
binaries: visual, instrumentation: adaptive optics, stars: individual: HD 2638, 30 Ari B, stars: solar-type
DOI:
10.1088/0004-6256/149/4/118
Bibliographic Code:
2015AJ....149..118R

Abstract

We discuss two multiple star systems that host known exoplanets: HD 2638 and 30 Ari B. Adaptive optics imagery revealed an additional stellar companion to both stars. We collected multi-epoch images of the systems with Robo-AO and the PALM-3000 adaptive optics systems at Palomar Observatory and provide relative photometry and astrometry. The astrometry indicates that the companions share common proper motion with their respective primaries. Both of the new companions have projected separations less than 30 AU from the exoplanet host star. Using the projected separations to compute orbital periods of the new stellar companions, HD 2638 has a period of 130 yr and 30 Ari B has a period of 80 yr. Previous studies have shown that the true period is most likely within a factor of three of these estimated values. The additional component to 30 Ari makes it the second confirmed quadruple system known to host an exoplanet. HD 2638 hosts a hot Jupiter and the discovery of a new companion strengthens the connection between hot Jupiters and binary stars. We place the systems on a color-magnitude diagram and derive masses for the companions which turn out to be roughly 0.5 solar mass stars.
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