KEPLER-424 b: A "LONELY'' HOT JUPITER THAT FOUND A COMPANION
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Hot Jupiter systems provide unique observational constraints for
migration models in multiple systems and binaries. We report on the
discovery of the Kepler-424 (KOI-214) two-planet system, which consists
of a transiting hot Jupiter (Kepler-424b) in a 3.31 day orbit
accompanied by a more massive outer companion in an eccentric (e =
0.3) 223 day orbit. The outer giant planet, Kepler-424c, is not
detected transiting the host star. The masses of both planets and the
orbital parameters for the second planet were determined using precise
radial velocity (RV) measurements from the Hobby-Eberly Telescope (HET)
and its High Resolution Spectrograph (HRS). In stark contrast to smaller
planets, hot Jupiters are predominantly found to be lacking any nearby
additional planets; they appear to be "lonely". This might be a
consequence of these systems having a highly dynamical past. The
Kepler-424 planetary system has a hot Jupiter in a multiple system,
similar to
Andromedae. We also present our results for Kepler-422 (KOI-22),
Kepler-77 (KOI-127), Kepler-43 (KOI-135), and Kepler-423 (KOI-183).
These results are based on spectroscopic data collected with the Nordic
Optical Telescope (NOT), the Keck 1 telescope, and HET. For all systems,
we rule out false positives based on various follow-up observations,
confirming the planetary nature of these companions. We performed a
comparison with planetary evolutionary models which indicate that these
five hot Jupiters have heavy element contents between 20 and 120 M ⊕.
Originalsprog | Engelsk |
---|---|
Artikelnummer | 151 |
Tidsskrift | The Astrophysical Journal Letters |
Vol/bind | 795 |
Udgave nummer | 2 |
ISSN | 0004-637X |
DOI | |
Status | Udgivet - 10 nov. 2014 |
ID: 138818712