J/A+A/585/A135 HD175607 RV, logRHK and Halpha index (Mortier+, 2016)
The HARPS search for southern extra-solar planets.
XXXIX. HD175607 b, 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.,
Udry S.
<Astron. Astrophys. 585, A135 (2016)>
=2016A&A...585A.135M 2016A&A...585A.135M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: planetary systems - stars: individual: HD 175607 -
techniques: radial velocities - stars: solar-type - stars: activity -
stars: abundances
Abstract:
The presence of a small-mass planet (Mp<0.1M{Jup}) 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 timespan of more than 9 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±0.02days 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 due to 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.
Description:
Table hd175607 contains the radial velocities and used stellar
activity indices of HD175607.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
19 01 05.49 -66 11 33.7 HD175607 = HIP 93373
------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
hd175607.dat 94 110 Radial velocities and activity of HD175607
--------------------------------------------------------------------------------
See also:
J/A+A/469/L43 : Radial velocities of Gl 581 (Udry+, 2007)
J/A+A/474/293 : Radial velocities of GJ 674 (Bonfils+, 2007)
J/A+A/493/639 : Velocity curves of HD 40307 (Mayor+, 2009)
J/A+A/493/645 : Gl 176 radial velocities (Forveille+, 2009)
J/A+A/496/513 : RV of 6 stars with long-period giant planets (Moutou+, 2009)
J/A+A/496/521 : Radial velocities of HD45364 (Correia+, 2009)
J/A+A/496/527 : Radial velocity curves of HD 47186 & HD 181433 (Bouchy+, 2009)
J/A+A/507/487 : GJ 581 radial velocity curve (Mayor+, 2009)
J/A+A/511/A21 : Radial velocities of GJ876 planetary system (Correia+, 2010)
J/A+A/512/A46 : Radial velocities of BD-08 2823 (Hebrard+, 2010)
J/A+A/512/A47 : Radial velocities of 3 stars with giant planets (Santos+ 2010)
J/A+A/512/A48 : HD125612, HD215497, HIP5158 HARPS RV curves (Lo Curto+, 2010)
J/A+A/523/A15 : HARPS XXIII: RV data for the 8 targets (Naef+, 2010)
J/A+A/526/A111 : Radial velocity of HD 85390, 90156, 103197 (Mordasini+, 2011)
J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)
J/A+A/526/A141 : Velocity monitoring of Gl 676A and HIP 12961 (Forveille+ 2011)
J/A+A/527/A63 : 7 new HARPS planetary systems RV (Moutou+, 2011)
J/A+A/528/A112 : Radial velocities of HD 10180 (Lovis+, 2011)
J/A+A/551/A59 : HD103774, HD109271 and BD-061339 RV curves (Lo Curto+, 2013)
J/A+A/556/A110 : HARPS radial velocities of GJ 163 (Bonfils+, 2013)
J/A+A/566/A35 : Radial velocities of HD 41248 (Santos+, 2014)
J/A+A/575/A119 : 3 HARPS M dwarfs RV and stellar activity
(Astudillo-Defru+, 2015)
J/A+A/576/A48 : Radial velocity monitoring for 6 stars (Moutou+, 2015)
J/A+A/585/A134 : HD1461, HD40307, and HD204313 radial velocities (Diaz+, 2016)
Byte-by-byte Description of file: hd175607.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.6 d BJD Barycentric Julian date (BJD-2400000)
13- 23 F11.5 km/s RV Radial velocity
24- 32 F9.5 km/s e_RV Error radial velocity
33- 41 F9.5 km/s FWHM Full width at half maximum of CCF
42- 51 F10.5 km/s BIS Bisector inverse slope of CCF
52- 59 F8.3 % Contrast Contrast of CCF
60- 68 F9.4 --- logRHK Activity index from CaII H&K lines
69- 76 F8.4 --- e_logRHK Error on logrhk
77- 85 F9.5 --- Ha Halpha index
86- 94 F9.5 --- e_Ha Error on Halpha index
--------------------------------------------------------------------------------
Acknowledgements:
Annelies Mortier, am352(at)st-andrews.ac.uk
References:
Pepe et al., Paper I 2004A&A...423..385P 2004A&A...423..385P
Santos et al., Paper II 2004A&A...426L..19S 2004A&A...426L..19S
Lovis et al., Paper III 2005A&A...437.1121L 2005A&A...437.1121L
Moutou et al., Paper IV 2005A&A...439..367M 2005A&A...439..367M
Udry et al., Paper V 2006A&A...447..361U 2006A&A...447..361U
Bonfils et al., Paper VI 2005A&A...443L..15B 2005A&A...443L..15B
Lo Curto et al., Paper VII 2006A&A...451..345L 2006A&A...451..345L
Pepe et al., Paper VIII 2007A&A...462..769P 2007A&A...462..769P
Naef et al., Paper IX 2007A&A...470..721N 2007A&A...470..721N
Bonfils et al., Paper X 2007A&A...474..293B 2007A&A...474..293B, Cat. J/A+A/474/293
Udry et al., Paper XI 2007A&A...469L..43U 2007A&A...469L..43U, Cat. J/A+A/469/L43
Santos et al., Paper XII 2007A&A...474..647S 2007A&A...474..647S
Mayor et al., Paper XIII 2009A&A...493..639M 2009A&A...493..639M, Cat. J/A+A/493/639
Forveille et al., Paper XIV 2009A&A...493..645F 2009A&A...493..645F, Cat. J/A+A/493/645
Moutou et al., Paper XV 2009A&A...496..513M 2009A&A...496..513M, Cat. J/A+A/496/513
Correia et al., Paper XVI 2009A&A...496..521C 2009A&A...496..521C, Cat. J/A+A/496/521
Bouchy et al., Paper XVII 2009A&A...496..527B 2009A&A...496..527B, Cat. J/A+A/496/527
Mayor et al., Paper XVIII 2009A&A...507..487M 2009A&A...507..487M, Cat. J/A+A/507/487
Correia et al., Paper XIX 2010A&A...511A..21C 2010A&A...511A..21C, Cat. J/A+A/511/A21
Hebrard et al., Paper XX 2010A&A...512A..46H 2010A&A...512A..46H, Cat. J/A+A/512/A46
Santos et al., Paper XXI 2010A&A...512A..47S 2010A&A...512A..47S, Cat. J/A+A/512/A47
Lo Curto et al., Paper XXII 2010A&A...512A..48L 2010A&A...512A..48L, Cat. J/A+A/512/A48
Naef et al., Paper XXIII 2010A&A...523A..15N 2010A&A...523A..15N, Cat. J/A+A/523/A15
Mordasini et al., Paper XXIV 2011A&A...526A.111M 2011A&A...526A.111M, Cat. J/A+A/526/A111
Santos et al., Paper XXV 2011A&A...526A.112S 2011A&A...526A.112S, Cat. J/A+A/526/A112
Forveille et al., Paper XXVI 2011A&A...526A.141F 2011A&A...526A.141F, Cat. J/A+A/526/A141
Moutou et al., Paper XXVII 2011A&A...527A..63M 2011A&A...527A..63M, Cat. J/A+A/527/A63
Lovis et al., Paper XXVIII 2011A&A...528A.112L 2011A&A...528A.112L, Cat. J/A+A/528/A112
Dumusque et al., Paper XXX 2011A&A...535A..55D 2011A&A...535A..55D, Cat. J/A+A/535/A55
Bonfils et al., Paper XXXI 2013A&A...549A.109B 2013A&A...549A.109B
Lo Curto et al., Paper XXXII 2013A&A...551A..59L 2013A&A...551A..59L, Cat. J/A+A/551/A59
Delfosse et al., Paper XXXIII 2013A&A...553A...8D 2013A&A...553A...8D
Bonfils et al., Paper XXXIV 2013A&A...556A.110B 2013A&A...556A.110B, Cat. J/A+A/556/A110
Santos et al., Paper XXXV 2014A&A...566A..35S 2014A&A...566A..35S, Cat. J/A+A/566/A35
Astudillo-Defru et al., Paper XXXVI 2015A&A...575A.119A 2015A&A...575A.119A, Cat. J/A+A/575/A119
Moutou et al., Paper XXXVII 2015A&A...576A..48M 2015A&A...576A..48M, Cat. J/A+A/576/A48
Diaz et al., Paper XXXVIII 2016A&A...585A.134D 2016A&A...585A.134D, Cat. J/A+A/585/A134
(End) A. Mortier [St Andrews University, UK], P. Vannier [CDS] 26-Nov-2015