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Kinematic and thermal signatures of the directly imaged protoplanet candidate around Elias 2-24

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arxiv 2301.08759 v1 pith:RNOLPI6D submitted 2023-01-20 astro-ph.EP astro-ph.SR

Kinematic and thermal signatures of the directly imaged protoplanet candidate around Elias 2-24

classification astro-ph.EP astro-ph.SR
keywords planetcandidateemissionassociateddirectlydisceliasgtrsim
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report kinematic and thermal signatures associated with the directly imaged protoplanet candidate in the Elias 2-24 disc. Using the DSHARP ALMA observations of the $^{12}$CO J=2-1 line, we show that the disc kinematics are perturbed, with a detached CO emission spot at the location of the planet candidate and traces of spiral wakes, and also that the observed CO emission intensities require local heating. While the foreground extinction hides the velocity channels associated with the planet, preventing a planet mass estimate, the level of gas heating implied by the CO emission indicates the presence of a warm, embedded giant planet. Comparison with models show this could either be a $\gtrsim 5$M$_\mathrm{Jup}$, or a lower mass ( $\gtrsim 2$M$_\mathrm{Jup}$) but accreting proto-planet.

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