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korth

Judith Korth

Postdoc

korth

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

Author

  • Silvia Sabotta
  • Petr Kabath
  • Judith Korth
  • Eike W. Guenther
  • Daniel Dupkala
  • Sascha Grziwa
  • Tereza Klocova
  • Marek Skarka

Summary, in English

Some theories of planet formation and evolution predict that intermediate-mass stars hostmore 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 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 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.

Publishing year

2019-10-21

Language

English

Pages

2069-2078

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

489

Issue

2

Document type

Journal article

Publisher

Oxford University Press

Keywords

  • Planetary systems
  • Stars: Activity
  • Stars: Oscillations
  • Techniques: Photometric
  • Techniques: Spectroscopic

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711