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Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237
European So Observ, D-85748 Garching, Germany.;Univ Munich, Univ Sternwarte Munchen, D-81679 Munich, Germany..
European So Observ, D-85748 Garching, Germany.;Univ Toulouse, UPS OMP, Inst Rech Astrophys & Planetol, F-31400 Toulouse, France..
European So Observ, D-85748 Garching, Germany..
INAF Osservatorio Astrofis Catania, I-95123 Catania, Italy..
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2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 582, A38Article in journal (Refereed) PublishedText
Abstract [en]

We analyse the magnetic activity characteristics of the planet-hosting Sun-like star, HD 1237, using HARPS spectro-polarimetric time-series data. We find evidence of rotational modulation of the magnetic longitudinal field measurements that is consistent with our ZDI analysis with a period of 7 days. We investigate the effect of customising the LSD mask to the line depths of the observed spectrum and find that it has a minimal effect on the shape of the extracted Stokes V profile but does result in a small increase in the S/N (similar to 7%). We find that using a Milne-Eddington solution to describe the local line profile provides a better fit to the LSD profiles in this slowly rotating star, which also affects the recovered ZDI field distribution. We also introduce a fit-stopping criterion based on the information content (entropy) of the ZDI map solution set. The recovered magnetic field maps show a strong (+90 G) ring-like azimuthal field distribution and a complex radial field dominating at mid latitudes (similar to 45 degrees). Similar magnetic field maps are recovered from data acquired five months apart. Future work will investigate how this surface magnetic field distribution affeccts the coronal magnetic field and extended environment around this planet-hosting star.

Place, publisher, year, edition, pages
2015. Vol. 582, A38
Keyword [en]
stars: activity, stars: magnetic field, stars: solar-type, stars: individual: HD 1237
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-269264DOI: 10.1051/0004-6361/201525771ISI: 000363538500038OAI: oai:DiVA.org:uu-269264DiVA: diva2:882720
Available from: 2015-12-15 Created: 2015-12-15 Last updated: 2015-12-15Bibliographically approved

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