학술논문
An In-Depth Look at TOI-3884b: a Super-Neptune Transiting a M4 Dwarf with Persistent Star Spot Crossings
Document Type
Working Paper
Author
Libby-Roberts, Jessica E.; Schutte, Maria; Hebb, Leslie; Kanodia, Shubham; Canas, Caleb; Stefansson, Gudmundur; Lin, Andrea S. J.; Mahadevan, Suvrath; Parts, Winter; Powers, Luke; Wisniewski, John; Bender, Chad F.; Cochran, William D.; Diddams, Scott A.; Everett, Mark E.; Gupta, Arvind F.; Halverson, Samuel; Kobulnicky, Henry A.; Kowalski, Adam F.; Larsen, Alexander; Monson, Andrew; Ninan, Joe P.; Parker, Brock A.; Ramsey, Lawrence W.; Robertson, Paul; Schwab, Christian; Swaby, Tera N.; Terrien, Ryan C.
Source
Subject
Language
Abstract
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 (HPF), we derive a planetary mass of 32.6 +7.3 -7.4 Earth Masses and radius of 6.4 +/- 0.2 Earth Radii. We detect a distinct star spot 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 star spot models show that TOI-3884b possesses a misaligned ($\lambda$ = 75 +\- 10 degrees) orbit which 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.
Comment: Accepted to AJ
Comment: Accepted to AJ