III.7 Planets orbiting stars more massive than the Sun

Guenther, E. W.; Sebastian, Daniel; Montañés-Rodŕıguez, P.; Geier,; Csizmadia, Sz.; Cusano, F.; Deeg, H. J.; Fridlund, M.; Grziwas, S.; Heber, U.; Heuser, C.; Rodler, F.; Tal-Or, L.; Team, Corot

doi:10.1051/978-2-7598-1876-1.c037

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…A dedicated survey for transiting planets of A-stars with the CoRoT satellite turned up one planet around an F-star, and six A-star host candidates. The number of candidates corresponds to the expectations if the frequency of massive, close-in planets of A-stars were the same as that of G-stars (Guenther et al 2016). However, confirming these candidates is difficult given that the stars are faint, and rapidly rotating.…”

supporting

confidence: 55%

K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion

Smith

Gandolfi

Barragán

et al. 2016

Mon. Not. R. Astron. Soc.

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We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19 ± 0.04) orbit around K2-99, an 11th magnitude subgiant in Virgo. We confirm the planetary nature of the companion with radial velocities, and determine that the star is a metal-rich ([Fe/H] = 0.20 ± 0.05) subgiant, with mass 1.60 +0.14 −0.10 M ⊙ and radius 3.1 ± 0.1 R ⊙ . The planet has a mass of 0.97 ± 0.09 M Jup and a radius 1.29 ± 0.05 R Jup . A measured systemic radial acceleration of −2.12 ± 0.04 m soffers compelling evidence for the existence of a third body in the system, perhaps a brown dwarf orbiting with a period of several hundred days.

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supporting

confidence: 55%

K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion

Smith

Gandolfi

Barragán

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Using spectroscopy obtained with UVES they obtained upper limits of their masses which are all in the planetary regime. Assuming that these candidates are hot Jupiters, the number of hot Jupiters is the same for A-type as for G-type stars (Guenther et al 2016). With an occurrence rate of 8.4 per cent instead of ≈ 1.2 per cent the frequency of hot Jupiters were about 7 times larger for A-type stars than for G-stars.…”

Section: Discussionmentioning

confidence: 95%

“…In the CoRoT survey, Guenther et al (2016) found 9 candidates for planets of A-type stars. Three of them are binaries, one is a brown dwarf.…”

Section: Discussionmentioning

confidence: 99%

Lack of close-in, massive planets of main-sequence A-type stars from Kepler

Sabotta

Kabáth

Korth

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Some theories of planet formation and evolution predict that intermediate-mass stars host more hot Jupiters than Sun-like stars, others reach the conclusion that such objects are very rare. By determining the frequencies of those planets we can test those theories.Based on the analysis of Kepler light curves it has been suggested that about 8 per cent of the intermediate-mass stars could have a close-in substellar companion. This would indicate a very high frequency of such objects. Up to now, there was no satisfactory proof or test of this hypothesis.We studied a previously reported sample of 166 planet candidates around mainsequence A-type stars in the Kepler field. We selected six of them for which we obtained extensive long-term radial velocity measurements with the Alfred-Jensch 2-m telescope in Tautenburg and the Perek 2-m telescope in Ondřejov. We derive upper limits of the masses of the planet candidates. We show that we are able to detect this kind of planet with our telescopes and their instrumentation using the example of MASCARA-1 b.With the transit finding pipeline EXOTRANS we confirm that there is no single transit event from a Jupiter-like planet in the light curves of those 166 stars. We furthermore determine that the upper limit for the occurrence rate of close-in, massive planets for A-type stars in the Kepler sample is around 0.75 per cent.We argue that there is currently little evidence for a very high frequency of close-in, massive planets of intermediate-mass stars.

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“…The survey strategy is explained in detail in Guenther et al (2016). We give a short summary on the target selection and the method, used to derive the radial velocity of the candidates.…”

Section: Identifying the Candidatesmentioning

confidence: 99%

Sub-stellar Companions of Intermediate-mass Stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b

Sebastian¹,

Guenther²,

Deleuil³

et al. 2022

Preprint

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Theories of planet formation give contradicting results of how frequent close-in giant planets of intermediate mass stars (IMSs; 1.3 ≤ M ★ ≤ 3.2 M ) are. Some theories predict a high rate of IMSs with close-in gas giants, while others predict a very low rate. Thus, determining the frequency of close-in giant planets of IMSs is an important test for theories of planet formation. We use the CoRoT survey to determine the absolute frequency of IMSs that harbour at least one close-in giant planet and compare it to that of solar-like stars. The CoRoT transit survey is ideal for this purpose, because of its completeness for gas-giant planets with orbital periods of less than 10 days and its large sample of main-sequence IMSs. We present a high precision radial velocity follow-up programme and conclude on 17 promising transit candidates of IMSs, observed with CoRoT. We report the detection of CoRoT-34b, a brown dwarf close to the hydrogen burning limit, orbiting a 1.1 Gyr A-type main-sequence star. We also confirm two inflated giant planets, CoRoT-35b, part of a possible planetary system around a metal-poor star, and CoRoT-36b on a misaligned orbit. We find that 0.12 ± 0.10 % of IMSs between 1.3 ≤ 𝑀 ★ ≤ 1.6𝑀 observed by CoRoT do harbour at least one close-in giant planet. This is significantly lower than the frequency (0.70 ± 0.16 %) for solar-mass stars, as well as the frequency of IMSs harbouring long-period planets (∼ 8 %).

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III.7 Planets orbiting stars more massive than the Sun

Cited by 3 publications

References 16 publications

K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion

K2-99: a subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion

Lack of close-in, massive planets of main-sequence A-type stars from Kepler

Sub-stellar Companions of Intermediate-mass Stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b

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