Universität zu Köln

Sabotta, Silvia ORCID: 0000-0001-9078-5574, Kabath, Petr, Korth, Judith ORCID: 0000-0002-0076-6239, Guenther, Eike W., Dupkala, Daniel, Grziwa, Sascha, Klocova, Tereza and Skarka, Marek ORCID: 0000-0002-7602-0046 (2019). Lack of close-in, massive planets of main-sequence A-type stars from Kepler. Mon. Not. Roy. Astron. Soc., 489 (2). S. 2069 - 2079. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

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 main-sequence 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 Ond.rejov. 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 EXTRANS 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sabotta, Silvia UNSPECIFIED orcid.org/0000-0001-9078-5574 UNSPECIFIED Kabath, Petr UNSPECIFIED UNSPECIFIED UNSPECIFIED Korth, Judith UNSPECIFIED orcid.org/0000-0002-0076-6239 UNSPECIFIED Guenther, Eike W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dupkala, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Grziwa, Sascha UNSPECIFIED UNSPECIFIED UNSPECIFIED Klocova, Tereza UNSPECIFIED UNSPECIFIED UNSPECIFIED Skarka, Marek UNSPECIFIED orcid.org/0000-0002-7602-0046 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-132659
DOI:	10.1093/mnras/stz2232
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	489
Number:	2
Page Range:	S. 2069 - 2079
Date:	2019
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Externe Einrichtungen > An-Institute > Associated Institutes of the Faculty of Mathematics and Natural Sciences > Rhenish Institute for Environmental Research - RIU
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GIANT PLANET; HOT JUPITER; MASSES; COMPANIONS; LINE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13265