2015A&A...583L...1O


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:36:22

2015A&A...583L...1O - Astronomy and Astrophysics, volume 583, L1-1 (2015/11-1)

Polar stellar-spots and grazing planetary transits. Possible explanation for the low number of discovered grazing planets.

OSHAGH M., SANTOS N.C., FIGUEIRA P., ADIBEKYAN V.Z., SANTERNE A., BARROS S.C.C. and LIMA J.J.G.

Abstract (from CDS):

We assess whether there is a physically feasible explanation for the few discovered (nearly) grazing planetary transits through all ground- and space-based transit surveys. We performed simulations to generate a synthetic distribution of detectable planets based on their impact parameter, and found that more (nearly) grazing planets should have been detected than have been detected. Our explanation for the insufficient number of (nearly) grazing planets is based on the simple assumption that many (nearly) grazing planets transit host stars that harbor a dark giant polar spot, and thus the transit light-curve vanishes due to the occultation of the grazing planet and the polar spot. We conclude by evaluating the properties required of polar spots to cause the grazing transit light-curve to disappear and find that the spot properties are compatible with the expected properties from observations.

Abstract Copyright:

Journal keyword(s): planetary systems - planets and satellites: detection - stars: activity - starspots - methods: numerical

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 WASP-45b Pl 00 20 56.9940389706 -35 59 53.747385579           ~ 22 1
2 CD-23 9677b Pl 11 01 35.8978900078 -23 51 38.384687448           ~ 31 1
3 HAT-P-27 * 14 51 04.1870409044 +05 56 50.548178856   13.18 12.19 11.98 11.23 G8 44 1
4 CoRoT-33b Pl? 18 38 33.9101911792 +05 37 28.787049157           ~ 9 0
5 CoRoT-25b Pl 18 42 31.1200588130 +06 30 49.746375398           ~ 9 1
6 BD+44 3020b Pl 18 56 14.3077765754 +44 31 05.389239372           ~ 50 1
7 Kepler-90b Pl 18 57 44.0383590355 +49 18 18.495822926           ~ 20 0
8 Kepler-447b Pl 19 01 04.4557486819 +48 33 35.944635820           ~ 26 0
9 Kepler-434b Pl 19 34 20.7343705605 +42 55 44.038822045           ~ 19 0
10 WASP-67b Pl 19 42 58.5217085119 -19 56 58.523005452           ~ 31 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:36:22

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