Sub-stellar companions of intermediate-mass stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b

Sebastian D, Guenther EW, Deleuil M, Dorsch M, Heber U, Heuser C, Gandolfi D, Grziwa S, Deeg HJ, Alonso R, Bouchy F, Csizmadia S, Cusano F, Fridlund M, Geier S, Irrgang A, Korth J, Nespral D, Rauer H, Tal-Or L (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 516

Pages Range: 636-655

Journal Issue: 1

DOI: 10.1093/mnras/stac2131

Abstract

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-circle dot) 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 d 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 per cent of IMSs between 1.3 <= M-* <= 1.6 M-circle dot observed by CoRoT do harbour at least one close-in giant planet. This is significantly lower than the frequency (0.70 +/- 0.16 per cent) for solar-mass stars, as well as the frequency of IMSs harbouring long-period planets (similar to 8 per cent).

Authors with CRIS profile

Involved external institutions

Thüringer Landessternwarte Tautenburg (TLS) - Karl-Schwarzschild-Observatorium Germany (DE) Aix-Marseille University / Aix-Marseille Université France (FR) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) Universität zu Köln Germany (DE) Instituto de Astrofísica de Canarias (IAC) Spain (ES) University of Geneva / Université de Genève (UNIGE) Switzerland (CH) Technische Universität Berlin Germany (DE) Leiden University Netherlands (NL) University of Birmingham United Kingdom (GB) Universität Potsdam Germany (DE) Chalmers University of Technology / Chalmers tekniska högskola Sweden (SE) Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR) / German Aerospace Center Germany (DE) Ariel University Israel (IL)

How to cite

APA:

Sebastian, D., Guenther, E.W., Deleuil, M., Dorsch, M., Heber, U., Heuser, C.,... Tal-Or, L. (2022). Sub-stellar companions of intermediate-mass stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b. Monthly Notices of the Royal Astronomical Society, 516(1), 636-655. https://dx.doi.org/10.1093/mnras/stac2131

MLA:

Sebastian, Daniel, et al. "Sub-stellar companions of intermediate-mass stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b." Monthly Notices of the Royal Astronomical Society 516.1 (2022): 636-655.

BibTeX: Download