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2025RNAAS...9..119S - Research Notes of the AAS, 9, 119 (2025/May-0)

A Preliminary Search for Planets and Exozodiacal Emission Around α Centauri A with JWST/MIRI.

SANGHI A., BEICHMAN C., MAWET D., BALMER W.O., LLOP-SAYSON J., PUEYO L., KERVELLA P., BOCCALETTI A., LAGAGE P.-O., SOMMER M., WYATT M., GODOY N., CHOQUET E., WAGNER K., AGUILAR J., AKESON R., BELIKOV R., BIDOT A., BRYDEN G., FOMALONT E., HENNING T., HINES D., HU R., LEISENRING J., LISSAUER J.J., QUARLES B., RESSLER M., SERABYN E., YGOUF M. and ZILINSKAS M.

Abstract (from CDS):

We present F1550C (15.5 μm) coronagraphic imaging observations of the nearest solar-type star α Cen A using the James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI). The observations, executed in 2025 February, were compromised by having only one successful roll and degraded performance due to a position mismatch (Δr ∼ 10 mas) between α Cen A and the best-matching reference observation behind the MIRI coronagraph. We set preliminary upper limits on both the presence of a planet and an exozodiacal dust disk. The observations are sensitive to a planet heated by α Cen A (200-250 K) with a radius ≳1 RJup at a separation of 1$\mathop{.}\limits^{^{\prime\prime} }$5 (2 au) and zodiacal dust emission at the level of ≳5-10 times the brightness of our own zodiacal cloud. A complete analysis of all JWST/MIRI observations of α Cen A is forthcoming in Paper I (Beichman & Sanghi et al. 2025, in preparation) and Paper II (Sanghi & Beichman et al. 2025, in preparation).

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): James Webb Space Telescope - Coronagraphic imaging - Extrasolar gaseous giant planets - Exozodiacal dust

Simbad objects: 6

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