The Warm Neptune GJ 3470b Has a Polar Orbit

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dc.contributor.authorStefansson, Gudmundur
dc.contributor.authorMahadevan, Suvrath
dc.contributor.authorPetrovich, Cristobal
dc.contributor.authorWinn, Joshua N.
dc.contributor.authorKanodia, Shubham
dc.contributor.authorMillholland, Sarah C.
dc.contributor.authorManey, Marissa
dc.contributor.authorCanas, Caleb, I
dc.contributor.authorWisniewski, John
dc.contributor.authorRobertson, Paul
dc.contributor.authorNinan, Joe P.
dc.contributor.authorFord, Eric B.
dc.contributor.authorBender, Chad F.
dc.contributor.authorBlake, Cullen H.
dc.contributor.authorCegla, Heather
dc.contributor.authorCochran, William D.
dc.contributor.authorDiddams, Scott A.
dc.contributor.authorDong, Jiayin
dc.contributor.authorEndl, Michael
dc.contributor.authorFredrick, Connor
dc.contributor.authorHalverson, Samuel
dc.contributor.authorHearty, Fred
dc.contributor.authorHebb, Leslie
dc.contributor.authorHirano, Teruyuki
dc.contributor.authorLin, Andrea S. J.
dc.contributor.authorLogsdon, Sarah E.
dc.contributor.authorLubar, Emily
dc.contributor.authorMcElwain, Michael W.
dc.contributor.authorMetcalf, Andrew J.
dc.contributor.authorMonson, Andrew
dc.contributor.authorRajagopal, Jayadev
dc.contributor.authorRamsey, Lawrence W.
dc.contributor.authorRoy, Arpita
dc.contributor.authorSchwab, Christian
dc.contributor.authorSchweiker, Heidi
dc.contributor.authorTerrien, Ryan C.
dc.contributor.authorWright, Jason T.
dc.date.accessioned2025-01-20T21:06:42Z
dc.date.available2025-01-20T21:06:42Z
dc.date.issued2022
dc.description.abstractThe warm Neptune GJ 3470b transits a nearby (d = 29 pc) bright slowly rotating M1.5-dwarf star. Using spectroscopic observations during two transits with the newly commissioned NEID spectrometer on the WIYN 3.5 m Telescope at Kitt Peak Observatory, we model the classical Rossiter-McLaughlin effect, yielding a sky-projected obliquity of lambda = 98(-12)(+15)degrees and a v sin i = 0.85(-033)(+0.27) km s(-1). Leveraging information about the rotation period and size of the host star, our analysis yields a true obliquity of psi = 95(-8)(+9)degrees, revealing that GJ 3470b is on a polar orbit. Using radial velocities from HIRES, HARPS, and the Habitable-zone Planet Finder, we show that the data are compatible with a long-term radial velocity (RV) slope of gamma = -0.0022 +/- 0.0011 m s(-1) day(-1) over a baseline of 12.9 yr. If the RV slope is due to acceleration from another companion in the system, we show that such a companion is capable of explaining the polar and mildly eccentric orbit of GJ 3470b using two different secular excitation models. The existence of an outer companion can be further constrained with additional RV observations, Gaia astrometry, and future high-contrast imaging observations. Lastly, we show that tidal heating from GJ 3470b's mild eccentricity has most likely inflated the radius of GJ 3470b by a factor of similar to 1.5-1.7, which could help account for its evaporating atmosphere.
dc.fuente.origenWOS
dc.identifier.doi10.3847/2041-8213/ac6e3c
dc.identifier.eissn2041-8213
dc.identifier.issn2041-8205
dc.identifier.urihttps://doi.org/10.3847/2041-8213/ac6e3c
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93365
dc.identifier.wosidWOS:000805131300001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal letters
dc.rightsacceso restringido
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleThe Warm Neptune GJ 3470b Has a Polar Orbit
dc.typeartículo
dc.volumen931
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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