Files in this item
HARPS-N solar RVs are dominated by large, bright magnetic regions
Item metadata
dc.contributor.author | Milbourne, T. W. | |
dc.contributor.author | Haywood, R. D. | |
dc.contributor.author | Phillips, D. F. | |
dc.contributor.author | Saar, S. H. | |
dc.contributor.author | Cegla, H. M. | |
dc.contributor.author | Cameron, A. C. | |
dc.contributor.author | Costes, J. | |
dc.contributor.author | Dumusque, X. | |
dc.contributor.author | Langellier, N. | |
dc.contributor.author | Latham, D. W. | |
dc.contributor.author | Maldonado, J. | |
dc.contributor.author | Malavolta, L. | |
dc.contributor.author | Mortier, A. | |
dc.contributor.author | Palumbo III, M. L. | |
dc.contributor.author | Thompson, S. | |
dc.contributor.author | Watson, C. A. | |
dc.contributor.author | Bouchy, F. | |
dc.contributor.author | Buchschacher, N. | |
dc.contributor.author | Cecconi, M. | |
dc.contributor.author | Charbonneau, D. | |
dc.contributor.author | Cosentino, R. | |
dc.contributor.author | Ghedina, A. | |
dc.contributor.author | Glenday, A. G. | |
dc.contributor.author | Gonzalez, M. | |
dc.contributor.author | Li, C-H. | |
dc.contributor.author | Lodi, M. | |
dc.contributor.author | López-Morales, M. | |
dc.contributor.author | Lovis, C. | |
dc.contributor.author | Mayor, M. | |
dc.contributor.author | Micela, G. | |
dc.contributor.author | Molinari, E. | |
dc.contributor.author | Pepe, F. | |
dc.contributor.author | Piotto, G. | |
dc.contributor.author | Rice, K. | |
dc.contributor.author | Sasselov, D. | |
dc.contributor.author | Ségransan, D. | |
dc.contributor.author | Sozzetti, A. | |
dc.contributor.author | Szentgyorgyi, A. | |
dc.contributor.author | Udry, S. | |
dc.contributor.author | Walsworth, R. L. | |
dc.date.accessioned | 2019-04-01T11:30:09Z | |
dc.date.available | 2019-04-01T11:30:09Z | |
dc.date.issued | 2019-03 | |
dc.identifier.citation | Milbourne , T W , Haywood , R D , Phillips , D F , Saar , S H , Cegla , H M , Cameron , A C , Costes , J , Dumusque , X , Langellier , N , Latham , D W , Maldonado , J , Malavolta , L , Mortier , A , Palumbo III , M L , Thompson , S , Watson , C A , Bouchy , F , Buchschacher , N , Cecconi , M , Charbonneau , D , Cosentino , R , Ghedina , A , Glenday , A G , Gonzalez , M , Li , C-H , Lodi , M , López-Morales , M , Lovis , C , Mayor , M , Micela , G , Molinari , E , Pepe , F , Piotto , G , Rice , K , Sasselov , D , Ségransan , D , Sozzetti , A , Szentgyorgyi , A , Udry , S & Walsworth , R L 2019 , ' HARPS-N solar RVs are dominated by large, bright magnetic regions ' , Astrophysical Journal , vol. 874 , no. 1 , 107 . https://doi.org/10.3847/1538-4357/ab064a | en |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | PURE: 258412653 | |
dc.identifier.other | PURE UUID: bf7f7770-4261-4ad7-9d77-a6c5f8bd36dd | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1902.04184v1 | |
dc.identifier.other | ORCID: /0000-0002-8863-7828/work/58531459 | |
dc.identifier.other | Scopus: 85064453635 | |
dc.identifier.other | WOS: 000462738400025 | |
dc.identifier.uri | https://hdl.handle.net/10023/17411 | |
dc.description.abstract | State-of-the-art radial-velocity (RV) exoplanet searches are currently limited by RV signals arising from stellar magnetic activity. We analyze solar observations acquired over a 3 yr period during the decline of Carrington Cycle 24 to test models of RV variation of Sun-like stars. A purpose-built solar telescope at the High Accuracy Radial-velocity Planet Searcher for the Northern hemisphere (HARPS-N) provides disk-integrated solar spectra, from which we extract RVs and logR'HK. The Solar Dynamics Observatory (SDO) provides disk-resolved images of magnetic activity. The Solar Radiation and Climate Experiment (SORCE) provides near-continuous solar photometry, analogous to a Kepler light curve. We verify that the SORCE photometry and HARPS-N logR'HK correlate strongly with the SDO-derived magnetic filling factor, while the HARPS-N RV variations do not. To explain this discrepancy, we test existing models of RV variations. We estimate the contributions of the suppression of convective blueshift and the rotational imbalance due to brightness inhomogeneities to the observed HARPS-N RVs. We investigate the time variation of these contributions over several rotation periods, and how these contributions depend on the area of active regions. We find that magnetic active regions smaller than 60 Mm2 do not significantly suppress convective blueshift. Our area-dependent model reduces the amplitude of activity-induced RV variations by a factor of two. The present study highlights the need to identify a proxy that correlates specifically with large, bright magnetic regions on the surfaces of exoplanet-hosting stars. | |
dc.format.extent | 12 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astrophysical Journal | en |
dc.rights | © 2019, The American Astronomical Society. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at https://doi.org/10.3847/1538-4357/ab064a | en |
dc.subject | Planets and satellites: detection | en |
dc.subject | Sun: activity | en |
dc.subject | Sun: faculae, plages | en |
dc.subject | Sun: granulation | en |
dc.subject | Sunspots | en |
dc.subject | Techniques: redial velocities | en |
dc.subject | QB Astronomy | en |
dc.subject | QC Physics | en |
dc.subject | NDAS | en |
dc.subject.lcc | QB | en |
dc.subject.lcc | QC | en |
dc.title | HARPS-N solar RVs are dominated by large, bright magnetic regions | en |
dc.type | Journal article | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.description.version | Publisher PDF | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. St Andrews Centre for Exoplanet Science | en |
dc.identifier.doi | https://doi.org/10.3847/1538-4357/ab064a | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | ST/M001296/1 | en |
This item appears in the following Collection(s)
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.