2012MNRAS.423.1006F

Query : 2012MNRAS.423.1006F

2012MNRAS.423.1006F - Mon. Not. R. Astron. Soc., 423, 1006-1017 (2012/June-3)

Magnetic field, differential rotation and activity of the hot-Jupiter-hosting star HD 179949.

FARES R., DONATI J.-F., MOUTOU C., JARDINE M., CAMERON A.C., LANZA A.F., BOHLENDER D., DIETERS S., MARTINEZ FIORENZANO A.F., MAGGIO A., PAGANO I. and SHKOLNIK E.L.

Abstract (from CDS):

HD 179949 is an F8V star, orbited by a giant planet at ∼ 8 R* every 3.092 514 d. The system was reported to undergo episodes of stellar activity enhancement modulated by the orbital period, interpreted as caused by star–planet interactions (SPIs). One possible cause of SPIs is the large-scale magnetic field of the host star in which the close-in giant planet orbits.

In this paper we present spectropolarimetric observations of HD 179949 during two observing campaigns (2009 September and 2007 June). We detect a weak large-scale magnetic field of a few gauss at the surface of the star. The field configuration is mainly poloidal at both observing epochs. The star is found to rotate differentially, with a surface rotation shear of dΩ= 0.216±0.061 rad/d, corresponding to equatorial and polar rotation periods of 7.62±0.07 and 10.3±0.8 d, respectively. The coronal field estimated by extrapolating the surface maps resembles a dipole tilted at ∼ 70°. We also find that the chromospheric activity of HD 179949 is mainly modulated by the rotation of the star, with two clear maxima per rotation period as expected from a highly tilted magnetosphere. In 2009 September, we find that the activity of HD 179949 shows hints of low-amplitude fluctuations with a period close to the beat period of the system.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): planet-star interactions - stars: activity - stars: individual: HD 179949 - stars: magnetic fields

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 179949 BY* 19 15 33.2300695008 -24 10 45.671448072   6.772 6.237     F8V 435 1

Query : 2012MNRAS.423.1006F

Basic data :
HD 179949 -- BY Dra Variable
Other object types: otypes_help 		* (2015A&A,HD,...), MIR (WISEA,WISE), BY* (2017ARep), PM* (2007A&A), V* (V*), X (1RXS), UV (TD1), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		19 15 33.2300695008 -24 10 45.671448072 (Optical) [ 0.0250 0.0281 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		19 12 30.5076648741 -24 15 58.713547130 [ 0.0250 0.0281 90 ]
Gal coord. (ep=J2000) : 		013.4555546706262 -15.7859465055363 [ 0.0250 0.0281 90 ]
Proper motions mas/yr : 		118.567 -102.364 [0.030 0.022 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -24.619 [0.0010] / z(spectroscopic) -0.000082 [0.000000] / cz -24.62 [0.00]
   (Opt) A 2018A&A...616A...7S
Parallaxes (mas): 		36.3115 [0.0375] A 2020yCat.1350....0G
Spectral type: 		F8V C 1988MSS...C04....0H
Fluxes (6) :
B 6.772 [0.015] D 2000A&A...355L..27H
V 6.237 [0.010] D 2000A&A...355L..27H
G 6.119344 [0.002800] C 2020yCat.1350....0G
J 5.296 [0.027] C 2003yCat.2246....0C
H 5.10 [0.04] C 2003yCat.2246....0C
K 4.936 [0.018] C 2003yCat.2246....0C
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1
: 1 		: 1691 Display criteria :

Identifiers (32) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 179949 HIP 94645 1RXS J191533.7-241114 UBV M 23594
CD-24 15161 HR 7291 SAO 187883 uvby98 100179949
CPD-24 6650 IRAS 19126-2415 SKY# 35741 V* V5652 Sgr
GC 26518 2MASS J19153322-2410455 SPOCS 833 WISEA J191533.32-241046.3
GEN# +1.00179949 NAME-IAU Gumala SRS 15386 WISE J191533.32-241046.5
GJ 749 PLX 4482.02 TD1 24207 YZ 114 13391
GSC 06875-03273 PMC 90-93 6590 TIC 2288734 Gaia DR3 6770313530317154560
HIC 94645 PPM 269532 TYC 6875-3273-1 Gaia DR2 6770313530317154560

References (435 between 1850 and 2026) (Total 435)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 7    Diameter : 1    Distance : 2    Var : 1    Rot : 12    Fe/H : 46    Plx : 5    PM : 5    SpT : 4   

   

Observing logs
Herschel : 2   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : HD 179949

Link by name to the catalogue in VizieR :

HD 179949 CD-24 15161 CPD-24 6650 GJ 749 GSC 06875-03273
HIC 94645 HIP 94645 HR 7291 IRAS 19126-2415 2MASS J19153322-2410455
PPM 269532 1RXS J191533.7-241114 SAO 187883 TD1 24207 TYC 6875-3273-1
uvby98 100179949 V* V5652 Sgr WISEA J191533.32-241046.3 WISE J191533.32-241046.5 Gaia DR3 6770313530317154560
Gaia DR2 6770313530317154560

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