St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Register / Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

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

Thumbnail
View/Open
Cameron_2016_A_A_HARPSXXXIX_FinalPublishedVersion.pdf (1.575Mb)
Date
01/2016
Author
Mortier, Annelies
Faria, J. P.
Santos, N. C.
Rajpaul, V.
Figueira, P.
Boisse, I.
Cameron, Andrew Collier
Dumusque, X.
Lo Curto, G.
Lovis, C.
Mayor, M.
Melo, C.
Pepe, F.
Queloz, D.
Santerne, A.
Ségransan, D.
Sousa, S. G.
Sozzetti, A.
Udry, S.
Funder
European Commission
Science & Technology Facilities Council
Science & Technology Facilities Council
PPARC - Now STFC
Science & Technology Facilities Council
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/M001296/1
ST/I000666/1
PP/D000890/1
ST/J001651/1
ST/G001006/1
PP/F000065/1
Keywords
Planetary systems
Stars: individual: HD 175607
Techniques: radial velocities
Stars: solar-type
Stars: activity
Stars: abundances
QB Astronomy
QC Physics
DAS
Metadata
Show full item record
Abstract
Context. The presence of a small-mass planet (Mp < 0.1 MJup) 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. Aims. In this paper, we present the analysis of HD 175607, 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. Methods. 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. Results. We find evidence for the presence of a small Neptune-mass planet (Mpsini = 8.98 ± 1.10 M⊕) 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 ~ 1400 d) is present in the data, for which more measurements are needed to constrain its nature and its properties. Conclusions. HD 175607 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.
Citation
Mortier , A , Faria , J P , Santos , N C , Rajpaul , V , Figueira , P , Boisse , I , Cameron , A C , Dumusque , X , Lo Curto , G , Lovis , C , Mayor , M , Melo , C , Pepe , F , Queloz , D , Santerne , A , Ségransan , D , Sousa , S G , Sozzetti , A & Udry , S 2016 , ' The HARPS search for southern extra-solar planets. XXXIX. HD175607 the most metal-poor G dwarf with an orbiting sub-Neptune ' , Astronomy & Astrophysics , vol. 585 , A135 . https://doi.org/10.1051/0004-6361/201526905
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201526905
ISSN
0004-6361
Type
Journal article
Rights
© ESO, 2016. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at http://dx.doi.org/10.1051/0004-6361/201526905
Description
The research leading to these results received funding from the European Union Seventh Framework Programme (FP7/2007−2013) under grant agreement number 313014 (ETAEARTH). JPF acknowledges support from FCT through grant reference SFRH/BD/93848/2013. This work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grant UID/FIS/04434/2013. P.F., N.C.S., and S.G.S. also acknowledge the support from FCT through Investigador FCT contracts of reference IF/01037/2013, IF/00169/2012, and IF/00028/2014, respectively, and POPH/FSE (EC) by FEDER funding through the programme “Programa Operacional de Factores de Competitividade − COMPETE”. This work results within the collaboration of the COST Action TD 1308. A.S. is supported by the European Union under a Marie Curie Intra-European Fellowship for Career Development with reference FP7-PEOPLE-2013-IEF, number 627202.
Collections
  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2015arXiv151103941M
URI
http://hdl.handle.net/10023/8154

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Related items

Showing items related by title, author, creator and subject.

  • A prospective new diagnostic technique for distinguishing eruptive and noneruptive active regions 

    Pagano, Paolo; Mackay, Duncan H.; Yardley, Stephanie L. (2019-09-26) - Journal article
    Active regions are the source of the majority of magnetic flux rope ejections that become coronal mass ejections (CMEs). To identify in advance which active regions will produce an ejection is key for both space weather ...
  • From dense hot Jupiter to low-density Neptune : the discovery of WASP-127b, WASP-136b, and WASP-138b 

    Lam, K. W. F.; Faedi, F.; Brown, D. J. A.; Anderson, D. R.; Delrez, L.; Gillon, M.; Hébrard, G.; Lendl, M.; Mancini, L.; Southworth, J.; Smalley, B.; Triaud, A. H. M.; Turner, O. D.; Hay, K. L.; Armstrong, D. J.; Barros, S. C. C.; Bonomo, A. S.; Bouchy, F.; Boumis, P.; Collier Cameron, A.; Doyle, A. P.; Hellier, C.; Henning, T.; Jehin, E.; King, G.; Kirk, J.; Louden, T.; Maxted, P. F. L.; McCormac, J. J.; Osborn, H. P.; Palle, E.; Pepe, F.; Pollacco, D.; Prieto-Arranz, J.; Queloz, D.; Rey, J.; Ségransan, D.; Udry, S.; Walker, S.; West, R. G.; Wheatley, P. J. (2017-03-01) - Journal article
    We report three newly discovered exoplanets from the SuperWASP survey. WASP-127b is a heavily inflated super-Neptune of mass 0.18 ± 0.02 MJ and radius 1.37 ± 0.04 RJ. This is one of the least massive planets discovered by ...
  • Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076 

    Osborn, H. P.; Bonfanti, A.; Gandolfi, D.; Hedges, C.; Leleu, A.; Fortier, A.; Futyan, D.; Gutermann, P.; Maxted, P. F.L.; Borsato, L.; Collins, K. A.; Da Silva, J. Gomes; Chew, Y. Gomez Maqueo; Hooton, M. J.; Lendl, M.; Parviainen, H.; Salmon, S.; Schanche, N.; Serrano, L. M.; Sousa, S. G.; Tuson, A.; Ulmer-Moll, S.; Van Grootel, V.; Wells, R. D.; Wilson, T. G.; Alibert, Y.; Alonso, R.; Anglada, G.; Asquier, J.; Barrado Y Navascues, D.; Baumjohann, W.; Beck, T.; Benz, W.; Biondi, F.; Bonfils, X.; Bouchy, F.; Brandeker, A.; Broeg, C.; Barczy, T.; Barros, S. C.C.; Cabrera, J.; Charnoz, S.; Cameron, A. Collier; Csizmadia, S.; Davies, M. B.; Deleuil, M.; Delrez, L.; Demory, B. O.; Ehrenreich, D.; Erikson, A.; Fossati, L.; Fridlund, M.; Gillon, M.; Gomez-Munoz, M. A.; Gudel, M.; Heng, K.; Hoyer, S.; Isaak, K. G.; Kiss, L.; Laskar, J.; Des Etangs, A. Lecavelier; Lovis, C.; Magrin, D.; Malavolta, L.; McCormac, J.; Nascimbeni, V.; Olofsson, G.; Ottensamer, R.; Pagano, I.; Palle, E.; Peter, G.; Piazza, D.; Piotto, G.; Pollacco, D.; Queloz, D.; Ragazzoni, R.; Rando, N.; Rauer, H.; Reimers, C.; Ribas, I.; Demangeon, O. D.S.; Smith, A. M.S.; Sabin, L.; Santos, N.; Scandariato, G.; Schroffenegger, U.; Schwarz, R. P.; Shporer, A.; Simon, A. E.; Steller, M.; Szabo, G. M.; Segransan, D.; Thomas, N.; Udry, S.; Walter, I.; Walton, N. (2022-08-25) - Journal article
    Context. TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting a bright (G = 8.9 mag), young (340 ±80 Myr) K-type star. Although a validated planetary system, the orbits of the two outer planets were ...
Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter