2020A&A...642A..72M


Query : 2020A&A...642A..72M

2020A&A...642A..72M - Astronomy and Astrophysics, volume 642A, 72-72 (2020/10-1)

Early science with SPIRou: near-infrared radial velocity and spectropolarimetry of the planet-hosting star HD 189733.

MOUTOU C., DALAL S., DONATI J.-F., MARTIOLI E., FOLSOM C.P., ARTIGAU E., BOISSE I., BOUCHY F., CARMONA A., COOK N.J., DELFOSSE X., DOYON R., FOUQUE P., GAISNE G., HEBRARD G., HOBSON M., KLEIN B., LECAVELIER DES ETANGS A. and MORIN J.

Abstract (from CDS):

SPIRou is the newest spectropolarimeter and high-precision velocimeter that has recently been installed at the Canada-France-Hawaii Telescope on Maunakea, Hawaii. It operates in the near-infrared and simultaneously covers the 0.98-2.35 µm domain at high spectral resolution. SPIRou is optimized for exoplanet search and characterization with the radial-velocity technique, and for polarization measurements in stellar lines and subsequent magnetic field studies. The host of the transiting hot Jupiter HD 189733 b has been observed during early science runs. We present the first near-infrared spectropolarimetric observations of the planet-hosting star as well as the stellar radial velocities as measured by SPIRou throughout the planetary orbit and two transit sequences. The planetary orbit and Rossiter-McLaughlin anomaly are both investigated and modeled. The orbital parameters and obliquity are all compatible with the values found in the optical. The obtained radial-velocity precision is compatible with about twice the photon-noise estimates for a K2 star under these conditions. The additional scatter around the orbit, of about 8m/s, agrees with previous results that showed that the activity-induced scatter is the dominant factor. We analyzed the polarimetric signal, Zeeman broadening, and chromospheric activity tracers such as the 1083nm HeI and the 1282nm Paβ lines to investigate stellar activity. First estimates of the average unsigned magnetic flux from the Zeeman broadening of the FeI lines give a magnetic flux of 290±58G, and the large-scale longitudinal field shows typical values of a few Gauss. These observations illustrate the potential of SPIRou for exoplanet characterization and magnetic and stellar activity studies.

Abstract Copyright: © C. Moutou et al. 2020

Journal keyword(s): planetary systems - stars: magnetic field - stars: activity - techniques: radial velocities - techniques: polarimetric - techniques: spectroscopic

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 BD+61 195 PM* 01 02 38.8680626986 +62 20 42.175257431   11.439   8.7   M1.5V 230 0
2 V* V2689 Ori RS* 05 36 30.9904989312 +11 19 40.327533804 11.508 10.276 8.898 7.963 7.140 K6V 139 0
3 HD 88230 Er* 10 11 22.1399492383 +49 27 15.251007087 9.23 7.94 6.61 5.36 4.56 K6VeFe-1 449 0
4 V* DS Leo BY* 11 02 38.3420210088 +21 58 01.700013360 12.246 11.049 9.572 8.638 7.634 M1.0Ve 209 0
5 HD 95735 Er* 11 03 20.1948195942 +35 58 11.576182057 10.030 8.960 7.520 5.99 4.79 M2+V 682 0
6 BD+16 2708 Er* 14 54 29.2361840107 +16 06 03.797990080 12.86 11.686 10.150 9.116 7.872 M3V 264 1
7 HD 189733 BY* 20 00 43.7129433648 +22 42 39.073143456 9.241 8.578 7.648 7.126 6.68 K2V 834 1
8 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1323 1

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2023.01.27-23:11:00

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