2022AJ....163...61D

Query : 2022AJ....163...61D

2022AJ....163...61D - Astron. J., 163, 61-61 (2022/February-0)

The TESS-Keck Survey. VIII. Confirmation of a transiting giant planet on an eccentric 261 day orbit with the Automated Planet Finder telescope.

DALBA P.A., KANE S.R., DRAGOMIR D., VILLANUEVA S., COLLINS K.A., JACOBS T.L., LACOURSE D.M., GAGLIANO R., KRISTIANSEN M.H., OMOHUNDRO M., SCHWENGELER H.M., TERENTEV I.A., VANDERBURG A., FULTON B., ISAACSON H., VAN ZANDT J., HOWARD A.W., THORNGREN D.P., HOWELL S.B., BATALHA N.M., CHONTOS A., CROSSFIELD I.J.M., DRESSING C.D., HUBER D., PETIGURA E.A., ROBERTSON P., ROY A., WEISS L.M., BEHMARD A., BEARD C., BRINKMAN C.L., GIACALONE S., HILL M.L., LUBIN J., MAYO A.W., MOCNIK T., MURPHY J.M.A., POLANSKI A.S., RICE M., ROSENTHAL L.J., RUBENZAHL R.A., SCARSDALE N., TURTELBOOM E.V., TYLER D., BENNI P., BOYCE P., ESPOSITO T.M., GIRARDIN E., LALOUM D., LEWIN P., MANN C.R., MARCHIS F., SCHWARZ R.P., SRDOC G., STEUER J., SIVARANI T., UNNI A., EISNER N.L., FETHEROLF T., LI Z., YAO X., PEPPER J., RICKER G.R., VANDERSPEK R., LATHAM D.W., SEAGER S., WINN J.N., JENKINS J.M., BURKE C.J., EASTMAN J.D., LUND M.B., RODRIGUEZ D.R., ROWDEN P., TING E.B. and VILLASENOR J.N.

Abstract (from CDS):

We report the discovery of TOI-2180 b, a 2.8 MJ giant planet orbiting a slightly evolved G5 host star. This planet transited only once in Cycle 2 of the primary Transiting Exoplanet Survey Satellite (TESS) mission. Citizen scientists identified the 24 hr single-transit event shortly after the data were released, allowing a Doppler monitoring campaign with the Automated Planet Finder telescope at Lick Observatory to begin promptly. The radial velocity observations refined the orbital period of TOI-2180 b to be 260.8 ± 0.6 days, revealed an orbital eccentricity of 0.368 ± 0.007, and discovered long-term acceleration from a more distant massive companion. We conducted ground-based photometry from 14 sites spread around the globe in an attempt to detect another transit. Although we did not make a clear transit detection, the nondetections improved the precision of the orbital period. We predict that TESS will likely detect another transit of TOI-2180 b in Sector 48 of its extended mission. We use giant planet structure models to retrieve the bulk heavy-element content of TOI-2180 b. When considered alongside other giant planets with orbital periods over 100 days, we find tentative evidence that the correlation between planet mass and metal enrichment relative to stellar is dependent on orbital properties. Single-transit discoveries like TOI-2180 b highlight the exciting potential of the TESS mission to find planets with long orbital periods and low irradiation fluxes despite the selection biases associated with the transit method.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Amateur astronomy - Extrasolar gaseous giant planets - Transit photometry - Radial velocity - Planetary interior

VizieR on-line data: <Available at CDS (J/AJ/163/61): table1.dat>

Simbad objects: 4

goto Full paper

goto View the references in ADS

Number of rows : 4
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 HD 238894b Pl 18 31 46.4908252896 +56 39 03.067073316           ~ 17 0
2 HD 238894 * 18 31 46.4908252896 +56 39 03.067073316   9.85 9.16     G5 13 0
3 Kepler-1704b Pl 19 24 48.2988338352 +51 08 39.405102360           ~ 23 0
4 Kepler-1514b Pl 19 30 30.5892070488 +37 51 36.487214028           ~ 31 0

To bookmark this query, right click on this link: simbad:objects in 2022AJ....163...61D and select 'bookmark this link' or equivalent in the popup menu