Three red giants with substellar-mass companions

A. Niedzielski, A. Wolszczan, G. Nowak, M. Adamów, K. Kowalik, G. Maciejewski, B. Deka-Szymankiewicz, M. Adamczyk

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Abstract

We present three giant stars from the ongoing Penn StateTorunacute; Planet Search with the HobbyEberly Telescope, which exhibit radial velocity (RV) variations that point to the presence of planetary-mass companions around them. BD + 49 828 is a M = 1.52 × 0.22 MO K0 giant with a = - m sin i 1.6+ MJ 0.2 0.4 minimum mass companion in a = 4.2+0.32 ?0.2 AU (2590+300 ?180d), e = 0.35+0.24 ?0.10 orbit. HD 95127, a log L LO = 2.28 × 0.38, R = 20 × 9 RO, M = 1.20 × 0.22 MO K0 giant, has a m sin i = - 5.01+ MJ 0.44 0.61 minimum mass companion in a = 1.28+0.01 ?0.01 AU (482+5 ?5d), e = 0.11+0.15 ?0.06 orbit. Finally, HD 216536 is a M = 1.36 × 0.38 MO K0 giant with a = - m sin i 1.47+ MJ 0.12 0.20 minimum mass companion in = - a 0.609+0.002 0.002 AU ( - 148.6+0.7 0.7d), e = 0.38+0.12 ?0.10 orbit. Both HD 95127 b and HD 216536 b in their compact orbits are very close to the engulfment zone and hence prone to ingestion in the near future. BD+49 828 b is among the longest-period planets detected with the RV technique until now and it will remain unaffected by stellar evolution up to a very late stage of its host. We discuss general properties of planetary systems around evolved stars and planet survivability using existing data on exoplanets in more detail.

Original languageEnglish (US)
Article number1
JournalAstrophysical Journal
Volume803
Issue number1
DOIs
StatePublished - Apr 10 2015

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Niedzielski, A., Wolszczan, A., Nowak, G., Adamów, M., Kowalik, K., Maciejewski, G., Deka-Szymankiewicz, B., & Adamczyk, M. (2015). Three red giants with substellar-mass companions. Astrophysical Journal, 803(1), [1]. https://doi.org/10.1088/0004-637X/803/1/1