The evolution of substellar companions of intermediate mass stars

• Applicants: Dr. Eike W. Guenther; Professor Dr. Ulrich Heber
• Subject Area: Astrophysics and Astronomy
• Term: from 2011 to 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 203253810

• Final Report Year: 2016

Final Report Abstract

In order to search for planets to A-type stars we searched the CoRoT data base for candidates, classified multi-object spectroscopy, from which a candidatie sample was isolated. Follow-up spectroscopy was carried out at several observatories to derive radial velocity curves and high-fidelity spectra for quantitative NLTE spectral analysis. A Jupiter-like planet was discovered for two candidates, the host stars, however, turned out to be early to mid-F stars. Six candidate exo­planets to A-type remain to be confirmed by complementing the observed data set. This number match exactly our expectation, if the frequency of such planets is the same as for G-type stars.

Publications

• ”Multiobject spectroscopy of stars in the CoRoT fields. I. Early-type stars in the CoRoT-fields IRa01, LRa01, LRa02”, A&A, 541, 34
  Sebastian, D., Guenther, E. W., Schaffenroth, V., Gandolfi, D., Geier, S., Heber, U., Deleuil, M. and Moutou, C.
  
• 2012, ”Multi-object spectroscopy of stars in the CoRoT fields. II. The stellar population of the CoRoT fields IRa01, LRa01, LRa02, and LRa06”, A&A, 543, 125
  Guenther, E. W., Gandolfi, D., Sebastian, D., Deleuil, M., Moutou, C., and Cusano, R
  
• 2015 ”A planet in a polar orbit of 1.4 solar-mass star”, European Physical Journal Web of Conferences, 101, 02001
  Guenther, E. W., Cusano, F., Deeg, H., Gandolfi, D., Geier, S., Grziwa, S., Heber, U., Tal-Or, L., Sebastian, D. and Rodler, F.
  
• 2015, ’Transiting Sub-stellar companions of Intermediate-mass stars”, European Physical Journal Web of Conferences, 101, 06056
  Sebastian, D., Guenther, E. W., Heber, U., Geier, S., and Grziwa, S.
  
• 2015, ”The Effects of Close-in Exoplanets on Their Host Stars”, in Characterizing Stellar and Exoplanetary Environments, Astrophysics and Space Science Library, 411, 169
  Guenther, E. W. and Geier, S.
  
• ”Mass of WASP-33b”, 2015, A&A, 578,L4
  Lehmann, H., Guenther, E., Sebastian, D., Bollinger, M., Hartmann, M., Mkrtichian, D. E.
  
• 2016, ”III.7 Planets orbiting stars more massive than the Sun”, in The CoRoT Legacy Book: The Adventure of the Ultra High Precision Photometry from Space, 149
  Guenther, E. W., Sebastian, D., Gandolfi, D., Montanés-Rodríguez, P., Geier, S., Csizmadia, S., Cusano, F., Deeg, H. J., Fridlund, M., Grziwas, S., Heber, U., Heuser, C., Rodler, F. Tal-Or, L. and CoRoT Team