2016A&A...585A..77H


Query : 2016A&A...585A..77H

2016A&A...585A..77H - Astronomy and Astrophysics, volume 585A, 77-77 (2016/1-1)

A spectro-polarimetric study of the planet-hosting G dwarf, HD 147513.

HUSSAIN G.A.J., ALVARADO-GOMEZ J.D., GRUNHUT J., DONATI J.-F., ALECIAN E., OKSALA M., MORIN J., FARES R., JARDINE M., DRAKE J.J., COHEN O., MATT S., PETIT P., REDFIELD S. and WALTER F.M.

Abstract (from CDS):

The results from a spectro-polarimetric study of the planet-hosting Sun-like star, HD 147513 (G5V), are presented here. Robust detections of Zeeman signatures at all observed epochs indicate a surface magnetic field, with longitudinal magnetic field strengths varying between 1.0-3.2G. Radial velocity variations from night to night modulate on a similar timescale to the longitudinal magnetic field measurements. These variations are therefore likely due to the rotational modulation of stellar active regions rather than the much longer timescale of the planetary orbit (Porb=528d). Both the longitudinal magnetic field measurements and radial velocity variations are consistent with a rotation period of 10±2-days, which are also consistent with the measured chromospheric activity level of the star ('logR'HK=-4.64). Together, these quantities indicate a low inclination angle, i∼18°. We present preliminary magnetic field maps of the star based on the above period and find a simple poloidal large-scale field. Chemical analyses of the star have revealed that it is likely to have undergone a barium-enrichment phase in its evolution because of a higher mass companion. Despite this, our study reveals that the star has a fairly typical activity level for its rotation period and spectral type. Future studies will enable us to explore the long-term evolution of the field, as well as to measure the stellar rotation period, with greater accuracy.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: magnetic field - stars: solar-type - stars: individual: HD 147513 - techniques: polarimetric - techniques: radial velocities

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 1237 PM* 00 16 12.6780107483 -79 51 04.244506480 7.692 7.335 6.578     G8V 230 1
2 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 848 0
3 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 439 2
4 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 481 0
5 HD 147513b Pl 16 24 01.2911377368 -39 11 34.729913940           ~ 51 1
6 HD 147513 PM* 16 24 01.2911377368 -39 11 34.729913940 6.17 6.02 5.376     G5V 347 1
7 CD-46 11540 LM* 17 28 39.9455781571 -46 53 42.688095874 12.177 10.973 9.407 8.337 7.006 M3V 252 1

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