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Title: FRIENDS OF HOT JUPITERS. II. NO CORRESPONDENCE BETWEEN HOT-JUPITER SPIN-ORBIT MISALIGNMENT AND THE INCIDENCE OF DIRECTLY IMAGED STELLAR COMPANIONS

Abstract

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 hot Jupiters toward to their present day positions. Many observed short-period gas giant planets also have orbits that are misaligned with respect to their star's spin axis, which has also been attributed to the presence of a massive outer companion on a non-coplanar orbit. We present the results of a multi-band direct imaging survey using Keck NIRC2 to measure the fraction of short-period gas giant planets found in multi-star systems. Over three years, we completed a survey of 50 targets ('Friends of Hot Jupiters') with 27 targets showing some signature of multi-body interaction (misaligned or eccentric orbits) and 23 targets in a control sample (well-aligned and circular orbits). We report the masses, projected separations, and confirmed common proper motion for the 19 stellar companions found around 17 stars. Correcting for survey incompleteness, we report companion fractions of 48% ± 9%, 47% ± 12%, and 51% ± 13% in our total, misaligned/eccentric, and control samples, respectively. This total stellar companion fraction is 2.8σ larger than the fraction of fieldmore » stars with companions approximately 50-2000 AU. We observe no correlation between misaligned/eccentric hot Jupiter systems and the incidence of stellar companions. Combining this result with our previous radial velocity survey, we determine that 72% ± 16% of hot Jupiters are part of multi-planet and/or multi-star systems.« less

Authors:
; ; ;  [1]; ;  [2];  [3];  [4];  [5];  [6]
  1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA (United States)
  2. Department of Physics, University of Notre Dame, Notre Dame, IN (United States)
  3. Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI (United States)
  4. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  5. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA (United States)
  6. Department of Astronomy, Boston University, Boston, MA (United States)
Publication Date:
OSTI Identifier:
22522507
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 800; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; CONTROL; CORRELATIONS; ECLIPSE; JUPITER PLANET; MASS; ORBITS; PROPER MOTION; RADIAL VELOCITY; RESOLUTION; SATELLITES; SPIN; STAR EVOLUTION; STARS

Citation Formats

Ngo, Henry, Knutson, Heather A., Hinkley, Sasha, Batygin, Konstantin, Crepp, Justin R., Bechter, Eric B., Howard, Andrew W., Johnson, John A., Morton, Timothy D., and Muirhead, Philip S., E-mail: hngo@caltech.edu. FRIENDS OF HOT JUPITERS. II. NO CORRESPONDENCE BETWEEN HOT-JUPITER SPIN-ORBIT MISALIGNMENT AND THE INCIDENCE OF DIRECTLY IMAGED STELLAR COMPANIONS. United States: N. p., 2015. Web. doi:10.1088/0004-637X/800/2/138.
Ngo, Henry, Knutson, Heather A., Hinkley, Sasha, Batygin, Konstantin, Crepp, Justin R., Bechter, Eric B., Howard, Andrew W., Johnson, John A., Morton, Timothy D., & Muirhead, Philip S., E-mail: hngo@caltech.edu. FRIENDS OF HOT JUPITERS. II. NO CORRESPONDENCE BETWEEN HOT-JUPITER SPIN-ORBIT MISALIGNMENT AND THE INCIDENCE OF DIRECTLY IMAGED STELLAR COMPANIONS. United States. doi:10.1088/0004-637X/800/2/138.
Ngo, Henry, Knutson, Heather A., Hinkley, Sasha, Batygin, Konstantin, Crepp, Justin R., Bechter, Eric B., Howard, Andrew W., Johnson, John A., Morton, Timothy D., and Muirhead, Philip S., E-mail: hngo@caltech.edu. Fri . "FRIENDS OF HOT JUPITERS. II. NO CORRESPONDENCE BETWEEN HOT-JUPITER SPIN-ORBIT MISALIGNMENT AND THE INCIDENCE OF DIRECTLY IMAGED STELLAR COMPANIONS". United States. doi:10.1088/0004-637X/800/2/138.
@article{osti_22522507,
title = {FRIENDS OF HOT JUPITERS. II. NO CORRESPONDENCE BETWEEN HOT-JUPITER SPIN-ORBIT MISALIGNMENT AND THE INCIDENCE OF DIRECTLY IMAGED STELLAR COMPANIONS},
author = {Ngo, Henry and Knutson, Heather A. and Hinkley, Sasha and Batygin, Konstantin and Crepp, Justin R. and Bechter, Eric B. and Howard, Andrew W. and Johnson, John A. and Morton, Timothy D. and Muirhead, Philip S., E-mail: hngo@caltech.edu},
abstractNote = {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 hot Jupiters toward to their present day positions. Many observed short-period gas giant planets also have orbits that are misaligned with respect to their star's spin axis, which has also been attributed to the presence of a massive outer companion on a non-coplanar orbit. We present the results of a multi-band direct imaging survey using Keck NIRC2 to measure the fraction of short-period gas giant planets found in multi-star systems. Over three years, we completed a survey of 50 targets ('Friends of Hot Jupiters') with 27 targets showing some signature of multi-body interaction (misaligned or eccentric orbits) and 23 targets in a control sample (well-aligned and circular orbits). We report the masses, projected separations, and confirmed common proper motion for the 19 stellar companions found around 17 stars. Correcting for survey incompleteness, we report companion fractions of 48% ± 9%, 47% ± 12%, and 51% ± 13% in our total, misaligned/eccentric, and control samples, respectively. This total stellar companion fraction is 2.8σ larger than the fraction of field stars with companions approximately 50-2000 AU. We observe no correlation between misaligned/eccentric hot Jupiter systems and the incidence of stellar companions. Combining this result with our previous radial velocity survey, we determine that 72% ± 16% of hot Jupiters are part of multi-planet and/or multi-star systems.},
doi = {10.1088/0004-637X/800/2/138},
journal = {Astrophysical Journal},
number = 2,
volume = 800,
place = {United States},
year = {Fri Feb 20 00:00:00 EST 2015},
month = {Fri Feb 20 00:00:00 EST 2015}
}