2016A&A...585A.135M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST03:54:30

2016A&A...585A.135M - Astronomy and Astrophysics, volume 585A, 135-135 (2016/1-1)

The HARPS search for southern extra-solar planets. XXXIX. HD175607, the most metal-poor G dwarf with an orbiting sub-Neptune.

MORTIER A., FARIA J.P., SANTOS N.C., RAJPAUL V., FIGUEIRA P., BOISSE I., COLLIER CAMERON A., DUMUSQUE X., LO CURTO G., LOVIS C., MAYOR M., MELO C., PEPE F., QUELOZ D., SANTERNE A., SEGRANSAN D., SOUSA S.G., SOZZETTI A. and UDRY S.

Abstract (from CDS):

The presence of a small-mass planet (Mp<0.1MJup) seems, to date, not to depend on metallicity, however, theoretical simulations have shown that stars with subsolar metallicities may be favoured for harbouring smaller planets. A large, dedicated survey of metal-poor stars with the HARPS spectrograph has thus been carried out to search for Neptunes and super-Earths. In this paper, we present the analysis of HD175607, an old G6 star with metallicity [Fe/H]=-0.62. We gathered 119 radial velocity measurements in 110 nights over a time span of more than nine years. The radial velocities were analysed using Lomb-Scargle periodograms, a genetic algorithm, a Markov chain Monte Carlo analysis, and a Gaussian processes analysis. The spectra were also used to derive stellar properties. Several activity indicators were analysed to study the effect of stellar activity on the radial velocities. We find evidence for the presence of a small Neptune-mass planet (Mpsini=8.98±1.10M) orbiting this star with an orbital period P = 29.01±0.02 days in a slightly eccentric orbit (e=0.11±0.08). The period of this Neptune is close to the estimated rotational period of the star. However, from a detailed analysis of the radial velocities together with the stellar activity, we conclude that the best explanation of the signal is indeed the presence of a planetary companion rather than stellar related. An additional longer period signal (P∼1400d) is present in the data, for which more measurements are needed to constrain its nature and its properties. HD175607 is the most metal-poor FGK dwarf with a detected low-mass planet amongst the currently known planet hosts. This discovery may thus have important consequences for planet formation and evolution theories.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: HD175607 - techniques: radial velocities - stars: solar-type - stars: activity - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/585/A135): hd175607.dat>

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 BD+57 793 * 04 21 52.7044170433 +57 49 01.892074012   10.27 9.85     F5V 131 2
2 BD+57 793b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 175 1
3 HD 33793 Ro* 05 11 40.5893175460 -45 01 06.353955874 11.624 10.433 8.853 7.9 6.899 M1VIp 283 0
4 HD 41248 PM* 06 00 32.7815442690 -56 09 42.597177626   9.42 8.81     G2V 53 1
5 CoRoT-7 * 06 43 49.4690410679 -01 03 46.825797768   12.78 11.73 11.36 10.87 K0V 175 1
6 HD 156384C PM* 17 18 58.8271844065 -34 59 48.612934284 12.96 11.79 10.22 10.05 8.82 M1.5V 164 1
7 CoRoT-11 EB* 18 42 44.9499508376 +05 56 15.652163640   13.73 12.939     F6V 42 1
8 CoRoT-11b Pl 18 42 44.9499508376 +05 56 15.652163640           ~ 39 1
9 HD 176507 * 19 00 35.9260434885 +01 02 10.642914549   9.74 9.34     F0V 3 0
10 HD 175607b Pl 19 01 05.4888630172 -66 11 33.642423195           ~ 2 0
11 HD 175607 PM* 19 01 05.4888630172 -66 11 33.642423195   9.31 8.61     G6V 52 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-03:54:30

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