期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 512, 期 4, 页码 4869-4876出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac767
关键词
planets and satellites: atmospheres; planets and satellites: aurorae; planets and satellites: detection; planets and satellites: magnetic fields; planet-star interactions; radio continuum: planetary systems
资金
- FWF [P27256-N27]
- Austrian Science Fund (FWF) [P30949-N36]
- Russian Science Foundation [18-12-00080]
- Russian Science Foundation [18-12-00080] Funding Source: Russian Science Foundation
- Austrian Science Fund (FWF) [P30949] Funding Source: Austrian Science Fund (FWF)
We investigate the conditions of the atmosphere and magnetosphere of the massive and close-in exoplanet upsilon Andromedae b (ups And b). We explore the possibility of radio emission produced by the Cyclotron Maser Instability (CMI) and whether it can escape its source region. The comparison between the local cyclotron frequency and the local plasma frequency depends on the planetary mass. The study determines at which mass the atmosphere becomes 'compact' and provides favorable conditions for the CMI.
We investigate the atmospheric and magnetospheric conditions of the massive, close-in exoplanet upsilon Andromedae b (hereafter ups And b). In particular, we explore whether radio emission can be produced by the Cyclotron Maser Instability (CMI), and whether this emission can escape from its source region. For this, we compare the local cyclotron frequency to the local plasma frequency. The planetary mass has a decisive impact on both of these frequencies: the cyclotron frequency depends on the (mass-dependent) estimate of the planetary magnetic moment, and the plasma frequency is determined by the (gravity-dependent) atmospheric profile. For this reason, the planetary mass is one of the decisive parameters determining whether the CMI can operate efficiently. As the precise planetary mass is unknown in the case of ups And b, we compare the plasma conditions for a range of hypothetical masses of the planet in order to determine at which mass the atmosphere becomes 'compact', i.e. is not strongly extended, and thus provides favourable conditions for the CMI. In the case of detected planetary radio emission, this approach can provide a new way to constrain the mass of an exoplanet for which only a minimum mass is known.
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