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26 April 2024 |
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The Starspots - Transit Depth Relation of the Evaporating Planet Candidate KIC 12557548b | | Hajime Kawahara
; Teruyuki Hirano
; Kenji Kurosaki
; Yuichi Ito
; Masahiro Ikoma
; | | Date: |
7 Aug 2013 | | Abstract: | Violent variation of transit depths and an ingress-egress asymmetry of the
transit light curve discovered in KIC 12557548 have been interpreted as
evidences of a catastrophic evaporation of atmosphere with dust (M_p gtrsim
1M_oplus/Gyr) from a close-in small planet. To explore what drives the
anomalous atmospheric escape, we perform time-series analysis of the transit
depth variation of Kepler archival data in ~ 3.5 years. We find that a ~ 30%
periodic variation of the transit depth with P_1 = 22.83 pm 0.21 days, which is
within the error of the rotation period of the host star estimated using the
light curve modulation, P_rot = 22.91 pm 0.24 days. We interpret the results as
an evidence that the atmospheric escape of KIC 12557548b correlates with the
stellar activity. We consider possible scenarios that account for both the mass
loss rate and the correlation with the stellar activity. The XUV-driven
evaporation is marginally acceptable if one accepts relatively high XUV flux
and high efficiency for converting the input energy to the kinetic energy of
the atmosphere. Star-planet magnetic interaction is another possible scenario
though huge uncertainty remains for the mass loss rate. | | Source: | arXiv, 1308.1585 | | Services: | Forum | Review | PDF | Favorites | |
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