2013A&A...549A...2L


Query : 2013A&A...549A...2L

2013A&A...549A...2L - Astronomy and Astrophysics, volume 549A, 2-2 (2013/1-1)

Planetary companions orbiting M giants HD 208527 and HD 220074.

LEE B.-C., HAN I. and PARK M.-G.

Abstract (from CDS):

The purpose of the present study is to research the origin of planetary companions by using a precise radial velocity (RV) survey. The high-resolution spectroscopy of the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) at Bohyunsan Optical Astronomy Observatory (BOAO) was used from September 2008 to June 2012. We report the detection of two exoplanets in orbit around HD 208527 and HD 220074 exhibiting periodic variations in RV of 875.5±5.8 and 672.1±3.7-days. The RV variations are not apparently related to the surface inhomogeneities, and a Keplerian motion of the planetary companion is the most likely explanation. Assuming possible stellar masses of 1.6±0.4 and 1.2±0.3M, we obtain the minimum masses for the exoplanets at 9.9±1.7 and 11.1±1.8MJup around HD 208527 and HD 220074 with orbital semi-major axes of 2.1±0.2 and 1.6±0.1AU and eccentricities of 0.08 and 0.14, respectively. We also find that the previously known spectral classification of HD 208527 and HD 220074 was in error. Our new estimation of stellar parameters suggests that both HD 208527 and HD 220074 are M giants. Therefore, HD 208527 and HD 220074 are so far the first candidate M giants found to harbor a planetary companion.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: HD 208527 - techniques: radial velocities - stars: individual: HD 220074

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * tau Cet PM* 01 44 04.0834226 -15 56 14.926552 4.43 4.22 3.50 2.88 2.41 G8V 1144 1
2 HD 13189 * 02 09 40.1721335781 +32 18 59.160743793   9.04 7.56     K1II-III 73 1
3 * 47 UMa PM* 10 59 27.9738644892 +40 25 48.922388918   5.66   4.7   G1-VFe-0.5 733 1
4 * 61 Cyg A BY* 21 06 53.9396100677 +38 44 57.897024357 7.50 6.39 5.21 4.19 3.54 K5V 974 0
5 HD 208527 * 21 56 23.9845774113 +21 14 23.486334463 10.090 8.060 6.370     K5V 60 1
6 HD 208527b Pl 21 56 23.9845774113 +21 14 23.486334463           ~ 5 1
7 HD 220074b Pl 23 20 14.3786868809 +61 58 12.464680364           ~ 5 1
8 HD 220074 * 23 20 14.3786868809 +61 58 12.464680364 10.070 8.070 6.400     M2III 34 1

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2021.10.27-10:03:50

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