10.5281/zenodo.5122821
https://zenodo.org/records/5122821
oai:zenodo.org:5122821
Feinstein, Adina
Adina
Feinstein
0000-0002-9464-8101
University of Chicago
Montet, Benjamin
Benjamin
Montet
0000-0001-7516-8308
University of New South Wales
Johnson, Marshall
Marshall
Johnson
0000-0002-5099-8185
Las Cumbres Observatory
Bean, Jacob
Jacob
Bean
0000-0003-4733-6532
University of Chicago
David, Trevor
Trevor
David
0000-0001-6534-6246
Center for Computational Astrophysics; American Museum of Natural History
Gully-Santiago, Michael
Michael
Gully-Santiago
0000-0002-4020-3457
University of Texas at Austin
Livingston, John
John
Livingston
0000-0002-4881-3620
University of Tokyo
Luger, Rodrigo
Rodrigo
Luger
0000-0002-0296-3826
Center for Computational Astrophysics
H-alpha and Ca II Infrared Triplet Variations During a Transit of the 23 Myr Planet V1298 Tau c
Zenodo
2021
2021-07-22
Poster
10.5281/zenodo.5122820
https://zenodo.org/communities/tsc2
Creative Commons Attribution 4.0 International
Young transiting exoplanets (<100 Myr) provide crucial insight into atmospheric evolution via photoevaporation. However, transmission spectroscopy measurements to determine atmospheric composition and mass loss are challenging due to the activity and prominent stellar surface inhomogeneities present on young stars. We observed a full transit of V1298 Tau c, a 23 Myr, 5.59 \(R_p/R_\oplus\) planet orbiting a young solar analogue with GRACES on Gemini-North. We measured the Doppler tomographic signal of V1298 Tau c and find a projected obliquity of \(\lambda = 5^\circ \pm 15^\circ\), indicating it is well-aligned. The tomographic signal is only seen in the chromospherically driven core of the Ca II Infrared Triplet (IRT), which may be the result of star-planet interactions. Additionally, we find that excess absorption of H\(\alpha\) decreases smoothly during the transit. While this could be a tentative detection an extended hydrogen atmosphere, we find this variation can be explained by the presence of starspots with surrounding facular regions. More observations both in- and out-of the transits of V1298 Tau c are required to determine the nature of the Ca II IRT and H\(\alpha\) line variations.
An interactive version of this poster can be found here!