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16456

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DataCite Commons2023-04-21 更新2025-04-15 收录
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http://esdcdoi.esac.esa.int/doi/html/data/astronomy/hst/16456.html
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Exoplanets provide the only means of observing hydrodynamic atmospheric escape in action. However comma absorption by the interstellar medium (ISM) has so far prevented the observation of transits in the Lyman-alpha core. Near the Lyman-alpha core comma photons are plentiful and transits are deep. Capitalizing on the recent discoveries of TESS comma it is now possible to push past this limitation. We have identified 2 planets confirmed since the last regular HST cycle in systems with radial velocities that shift the host star.s Lyman-alpha line away from ISM absorption. These systems provide the potential to characterize the Lyman-alpha transits of planets smaller than Neptune and observe material escaping at velocities below 30 km-s for the first time. Doing so would enable previously infeasible tests of outflow models. It would also provide insight into the role of hydrodynamic escape in shaping the sub-Neptune planet population. Lyman-alpha reconnaissance of these 2 systems is the prudent first step toward these goals. Reconnaissance will eliminate key V1.0s regarding the host star.s intrinsic Lyman-alpha flux and the column depth of the intervening ISM. At the same time comma this program will check for signs of deep Lyman-alpha transits. Doing so will enable informed planning of follow up observations to characterize the Lyman-alpha transits of the highest priority targets during the next regular HST cycle.
提供机构:
European Space Agency
创建时间:
2023-04-21
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