TY - JOUR
T1 - A spectro-polarimetric study of the planet-hosting G dwarf, HD 147513
AU - Hussain, G. A.J.
AU - Alvarado-Gómez, J. D.
AU - Grunhut, J.
AU - Donati, J. F.
AU - Alecian, E.
AU - Oksala, M.
AU - Morin, J.
AU - Fares, R.
AU - Jardine, M.
AU - Drake, J. J.
AU - Cohen, O.
AU - Matt, S.
AU - Petit, P.
AU - Redfield, S.
AU - Walter, F. M.
N1 - Funding Information:
Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under the programme ID 089.D-0138 and using spectra downloaded from the ESO Science Archive Facility under the request number GHUSSAIN-162114. We also thank the IDEX initiative at Université Fédérale Toulouse Midi-Pyrénées (UFT-MiP) for funding the "STEPS" collaboration through the Chaire d''Attractivité programme, which enables G.A.J.H. to carry out regular research visits to Toulouse.
Funding Information:
Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under the programme ID 089.D-0138 and using spectra downloaded from the ESO Science Archive Facility under the request number GHUSSAIN-162114. We also thank the IDEX initiative at Université Fédérale Toulouse Midi-Pyrénées (UFT-MiP) for funding the “STEPS” collaboration through the Chaire d’Attractivité programme, which enables G.A.J.H. to carry out regular research visits to Toulouse.
Publisher Copyright:
© ESO, 2015.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - 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 1.0-3.2 G. 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 = 528 d). 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 (′log R′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.
AB - 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 1.0-3.2 G. 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 = 528 d). 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 (′log R′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.
KW - Stars: activity
KW - Stars: individual: HD 147513
KW - Stars: magnetic field
KW - Stars: solar-type
KW - Techniques: polarimetric
KW - Techniques: radial velocities
UR - http://www.scopus.com/inward/record.url?scp=84952683013&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84952683013&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201526595
DO - 10.1051/0004-6361/201526595
M3 - Article
AN - SCOPUS:84952683013
SN - 0004-6361
VL - 585
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A77
ER -