2010A&A...524A..47G


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.17CET12:26:11

2010A&A...524A..47G - Astronomy and Astrophysics, volume 524, A47-47 (2010/12-1)

HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet.

GAULME P., DEHEUVELS S., WEISS W.W., MOSSER B., MOUTOU C., BRUNTT H., DONATI J.-F., VANNIER M., GUILLOT T., APPOURCHAUX T., MICHEL E., AUVERGNE M., SAMADI R., BAUDIN F., CATALA C. and BAGLIN A.

Abstract (from CDS):

HD 46375 is known to host a Saturn-like exoplanet orbiting at 0.04 AU from its host star. Stellar light reflected by the planet was tentatively identified in the 34-day CoRoT run acquired in October-November 2008. We constrain the properties of the magnetic field of HD 46375 based on spectropolarimetric observations with the NARVAL spectrograph at the Pic du Midi observatory. In addition, we use a high-resolution NARVAL flux spectrum to contrain the atmospheric parameters. With these constraints, we perform an asteroseismic analysis and modelling of HD 46375 using the frequencies extracted from the CoRoT light curve. We used Zeeman Doppler imaging to reconstruct the magnetic map of the stellar surface. In the spectroscopic analysis we fitted isolated lines using 1D LTE atmosphere models. This analysis was used to constrain the effective temperature, surface gravity, and chemical composition of the star. To extract information about the p-mode oscillations, we used a technique based on the envelope autocorrelation function (EACF). From the Zeeman Doppler imaging observations, we observe a magnetic field of ≃5 Gauss. From the spectral analysis, HD 46375 is inferred to be an unevolved K0 type star with high metallicity [Fe/H]=+0.39. Owing to the relative faintness of the star (mhip=8.05), the signal-to-noise ratio is too low to identify individual modes. However, we measure the p-mode excess power and large separation Δν0=153.0±0.7µHz. We are able do constrain the fundamental parameters of the star thanks to spectrometric and seismic analyses. We conclude that HD 46375 is similar to a young version of α Cen B. This work is of special interest because of its combination of exoplanetary science and asteroseismology, which are the subjects of the current Kepler mission and the proposed Plato mission.

Abstract Copyright:

Journal keyword(s): methods: data analysis - methods: observational - planetary systems - stars: oscillations - stars: individual: HD46375 - stars: magnetic field

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * tau Cet PM* 01 44 04.0834226 -15 56 14.926552 4.43 4.22 3.50 2.88 2.41 G8V 1067 1
2 * iot Hor PM* 02 42 33.4664838826 -50 48 01.056222150   5.97 5.40     F8V 333 1
3 HD 46375 PM* 06 33 12.6225933827 +05 27 46.527797938   8.70 7.84     K1IV 201 2
4 HD 49385A PM* 06 48 11.5030662194 +00 18 17.893672741   7.952 7.399 8.28   G0V 69 1
5 * tau Boo ** 13 47 15.74340 +17 27 24.8552 5.02 4.98 4.49 4.09 3.85 F7IV-V 863 1
6 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 793 0
7 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 865 1
8 * 70 Oph A SB* 18 05 27.370543 +02 29 59.31669       3.6   K0V 201 0
9 HD 175726 PM* 18 56 37.1722379815 +04 15 54.462821656   7.28 6.71     G0V 86 0
10 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K0V+M4V 689 1

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2019.11.17-12:26:11

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