Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237

被引：29

作者：

Alvarado-Gomez, J. D. ^{[1
,2
]}

Hussain, G. A. J. ^{[1
,4
]}

Grunhut, J. ^{[1
]}

Fares, R. ^{[3
]}

Donati, J. -F. ^{[4
,5
]}

Alecian, E. ^{[6
,7
]}

Kochukhov, O. ^{[8
]}

Oksala, M. ^{[7
]}

Morin, J. ^{[9
,10
]}

Redfield, S. ^{[11
]}

Cohen, O. ^{[12
]}

Drake, J. J. ^{[12
]}

Jardine, M. ^{[13
]}

Matt, S. ^{[14
]}

Petit, P. ^{[4
,5
]}

Walter, F. M. ^{[15
]}

机构：

[1] European So Observ, D-85748 Garching, Germany

[2] Univ Munich, Univ Sternwarte Munchen, D-81679 Munich, Germany

[3] INAF Osservatorio Astrofis Catania, I-95123 Catania, Italy

[4] Univ Toulouse, UPS OMP, Inst Rech Astrophys & Planetol, F-31400 Toulouse, France

[5] CNRS, Inst Rech Astrophys & Planetol, F-31400 Toulouse, France

[6] UJF Grenoble 1, CNRS, INSU, IPAG,UMR 5274, Grenoble, France

[7] Univ Paris Diderot, UPMC, CNRS, LESIA,Observ Paris,UMR 8109, F-92190 Meudon, France

[8] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[9] CNRS, UMR 5299, LUPM, F-34095 Montpellier 05, France

[10] Univ Montpellier, F-34095 Montpellier 05, France

[11] Wesleyan Univ, Dept Astron, Van Vleck Observ, Middletown, CT 06459 USA

[12] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[13] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[14] Univ Exeter, Dept Phys & Astron, Exeter EX4 4SB, Devon, England

[15] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 582卷

关键词：

stars: activity; stars: magnetic field; stars: solar-type; stars: individual: HD 1237; RADIAL-VELOCITY VARIATIONS; EXTRASOLAR GIANT PLANETS; MAIN-SEQUENCE STARS; X-RAY-EMISSION; LOW-MASS STARS; T-TAURI; STELLAR CORONAE; EPSILON-ERIDANI; DOPPLER IMAGES; AGE ESTIMATION;

D O I：

10.1051/0004-6361/201525771

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：12

共 39 条

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