Bibcode
Niedzielski, A.; Wolszczan, A.; Nowak, G.; Adamów, M.; Kowalik, K.; Maciejewski, G.; Deka-Szymankiewicz, B.; Adamczyk, M.
Bibliographical reference
The Astrophysical Journal, Volume 803, Issue 1, article id. 1, 13 pp. (2015).
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4
2015
Journal
Citations
19
Refereed citations
17
Description
We present three giant stars from the ongoing Penn
State–Toruń Planet Search with the Hobby–Eberly
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 {{M}ȯ } K0 giant with a m sin
i=1.6-0.2+0.4 {{M}J} 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/{{L}ȯ }=2.28+/- 0.38, R=20+/- 9 {{R}ȯ
}, M=1.20+/- 0.22 {{M}ȯ } K0 giant, has a m sin i
= 5.01-0.44+0.61 {{M}J} 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 {{M}ȯ } K0 giant with a msin
i=1.47-0.12+0.20 {{M}J} 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.
Based on observations obtained with the Hobby–Eberly Telescope,
which is a joint project of the University of Texas at Austin, the
Pennsylvania State University, Stanford University,
Ludwig-Maximilians-Universität München, and
Georg-August-Universität Göttingen.
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