2023AJ....165..249L

Query : 2023AJ....165..249L

2023AJ....165..249L - Astron. J., 165, 249 (2023/June-0)

An In-depth Look at TOI-3884b: A Super-Neptune Transiting an M4Dwarf with Persistent Starspot Crossings.

LIBBY-ROBERTS J.E., SCHUTTE M., HEBB L., KANODIA S., CANAS C.I., STEFANSSON G., LIN A.S.J., MAHADEVAN S., PARTS W., POWERS L., WISNIEWSKI J., BENDER C.F., COCHRAN W.D., DIDDAMS S.A., EVERETT M.E., GUPTA A.F., HALVERSON S., KOBULNICKY H.A., KOWALSKI A.F., LARSEN A., MONSON A., NINAN J.P., PARKER B.A., RAMSEY L.W., ROBERTSON P., SCHWAB C., SWABY T.N. and TERRIEN R.C.

Abstract (from CDS):

We perform an in-depth analysis of the recently validated TOI-3884 system, an M4-dwarf star with a transiting super-Neptune. Using high-precision light curves obtained with the 3.5 m Apache Point Observatory and radial velocity observations with the Habitable-zone Planet Finder, we derive a planetary mass of ${32.6}_{-7.4}^{+7.3}\,{M}_{\oplus }$ and radius of 6.4 ± 0.2 R⊕. We detect a distinct starspot crossing event occurring just after ingress and spanning half the transit for every transit. We determine this spot feature to be wavelength dependent with the amplitude and duration evolving slightly over time. Best-fit starspot models show that TOI-3884b possesses a misaligned (λ = 75° ± 10°) orbit that crosses a giant pole spot. This system presents a rare opportunity for studies into the nature of both a misaligned super-Neptune and spot evolution on an active mid-M dwarf.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet astronomy - Exoplanets - Exoplanet detection methods - Starspots

Simbad objects: 10

goto Full paper

goto View the references in ADS

Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 G 268-38 PM* 00 44 59.3309137511 -15 16 17.542839990     14.150 13.801 11.19 M4.5V 197 0
2 LP 424-4 PM* 07 59 05.8395356736 +15 23 29.236065000   13.5   11.934   M2.0V 172 1
3 NAME LP 424-4b Pl 07 59 05.8395356736 +15 23 29.236065000           ~ 387 1
4 Ross 905b Pl 11 42 11.0933350978 +26 42 23.650782778           ~ 913 1
5 Ross 128 PM* 11 47 44.3972681420 +00 48 16.400337591 14.223 12.905 11.153 9.859 8.184 dM4 484 0
6 TOI-3884b Pl 12 06 17.4370907952 +12 30 24.883810596           ~ 18 0
7 LSPM J1206+1230 PM* 12 06 17.4370907952 +12 30 24.883810596   16.8   14.6   ~ 25 0
8 WASP-107b Pl 12 33 32.8441110816 -10 08 46.225572324           ~ 289 0
9 BD+47 2936b Pl 19 50 50.2472976936 +48 04 51.101390496           ~ 493 1
10 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0

To bookmark this query, right click on this link: simbad:objects in 2023AJ....165..249L and select 'bookmark this link' or equivalent in the popup menu