PDS 70b Shows Stellar-like Carbon-to-oxygen Ratio

The ~5 Myr PDS 70 is the only known system with protoplanets residing in the cavity of the circumstellar disk from which they formed, ideal for studying exoplanet formation and evolution within its natal environment. Here, we report the first spin constraint and C/O measurement of PDS 70b from Keck/...

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Veröffentlicht in:	Astrophysical journal. Letters 2024-12, Vol.977 (2), p.L47
Hauptverfasser:	Hsu, Chih-Chun, Wang, Jason J., Blake, Geoffrey A., Xuan, Jerry W., Zhang, Yapeng, Ruffio, Jean-Baptiste, Horstman, Katelyn, Cronin, Julianne, Sappey, Ben, Xin, Yinzi, Finnerty, Luke, Echeverri, Daniel, Mawet, Dimitri, Jovanovic, Nemanja, Do Ó, Clarissa R., Baker, Ashley, Bartos, Randall, Calvin, Benjamin, Cetre, Sylvain, Delorme, Jacques-Robert, Doppmann, Gregory W., Fitzgerald, Michael P., Liberman, Joshua, López, Ronald A., Morris, Evan, Pezzato-Rovner, Jacklyn, Schofield, Tobias, Skemer, Andrew, Wallace, J. Kent, Wang, Ji
Format:	Artikel
Sprache:	eng
Schlagworte:	Exoplanet atmospheres Exoplanet formation High angular resolution High resolution spectroscopy
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Zusammenfassung:	The ~5 Myr PDS 70 is the only known system with protoplanets residing in the cavity of the circumstellar disk from which they formed, ideal for studying exoplanet formation and evolution within its natal environment. Here, we report the first spin constraint and C/O measurement of PDS 70b from Keck/KPIC high-resolution spectroscopy. We detected CO (3.8 σ ) and H 2 O (3.5 σ ) molecules in the PDS 70b atmosphere via cross correlation, with a combined CO and H 2 O template detection significance of 4.2 σ . Our forward-model fits, using BT-Settl model grids, provide an upper limit for the spin rate of PDS 70b (
ISSN:	2041-8205 2041-8213
DOI:	10.3847/2041-8213/ad95e8