2009A&A...504..561W


Query : 2009A&A...504..561W

2009A&A...504..561W - Astronomy and Astrophysics, volume 504, 561-564 (2009/9-3)

Transit mapping of a starspot on CoRoT-2. Probing a stellar surface with planetary transits.

WOLTER U., SCHMITT J.H.M.M., HUBER K.F., CZESLA S., MUELLER H.M., GUENTHER E.W. and HATZES A.P.

Abstract (from CDS):

We analyze variations in the transit lightcurves of CoRoT-2b, a massive hot Jupiter orbiting a highly active G star. We use one transit lightcurve to eclipse-map a photospheric spot occulted by the planet. In this case study we determine the size and longitude of the eclipsed portion of the starspot and systematically study the corresponding uncertainties. We determine a spot radius between 4.5° and 10.5° on the stellar surface and the spot longitude with a precision of about ±1 degree. Given the well-known transit geometry of the CoRoT-2 system, this implies a reliable detection of spots on latitudes typically covered by sunspots; the size of the modelled spot is comparable to large spot groups on the Sun. We discuss the future potential of eclipse mapping by planetary transits for the high-resolution analysis of stellar surface features.

Abstract Copyright:

Journal keyword(s): stars: planetary systems - stars: activity - stars: late-type - stars: imaging - stars: individual: CoRoT-2

Simbad objects: 4

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Number of rows : 4
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 NAME V672 Lyr b Pl 19 04 09.8516024106 +36 37 57.445911611           ~ 325 1
2 CoRoT-2 * 19 27 06.4944378024 +01 23 01.359897468   13.422 12.568 12.204 11.49 G7V+K9V 239 2
3 HD 189733 BY* 20 00 43.7129433648 +22 42 39.073143456 9.241 8.578 7.648 7.126 6.68 K2V 834 1
4 HD 209458 V* 22 03 10.7727465312 +18 53 03.549393384   8.21 7.63     F9V 1070 1

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2023.02.07-05:12:41

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