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Author (up) Addison, BC.; Wright, DJ.; Nicholson, BA.; Cale, B.; Mocnik, T.; Huber, D.; Plavchan, P.; Wittenmyer, RA.; Vanderburg, A.; Chaplin, WJ.; Chontos, A.; Clark, JT.; Eastman, JD.; Ziegler, C.; Brahm, R.; Carter, BD.; Clerte, M.; Espinoza, N.; Horner, J.; Bentley, J.; Jordan, A.; Kane, SR.; Kielkopf, JF.; Laychock, E.; Mengel, MW.; Okumura, J.; Stassun, KG.; Bedding, TR.; Bowler, BP.; Burnelis, A.; Blanco-Cuaresma, S.; Collins, M.; Crossfield, I.; Davis, AB.; Evensberget, D.; Heitzmann, A.; Howell, SB.; Law, N.; Mann, AW.; Marsden, SC.; Matson, RA.; O'Connor, JH.; Shporer, A.; Stevens, C.; Tinney, CG.; Tylor, C.; Wang, SH.; Zhang, H.; Henning, T.; Kossakowski, D.; Ricker, G.; Sarkis, P.; Schlecker, M.; Torres, P.; Vanderspek, R.; Latham, DW.; Seager, S.; Winn, JN.; Jenkins, JM.; Mireles, I.; Rowden, P.; Pepper, J.; Daylan, T.; Schlieder, JE.; Collins, KA.; Collins, KI.; Tan, TG.; Ball, WH.; Basu, S.; Buzasi, DL.; Campante, TL.; Corsaro, E.; Gonzalez-Cuesta, L.; Davies, GR.; de Almeida, L.; do Nascimento, JD.; Garcia, RA.; Guo, Z.; Handberg, R.; Hekker, S.; Hey, DR.; Kallinger, T.; Kawaler, SD.; Kayhan, C.; Kuszlewicz, JS.; Lund, MN.; Lyttle, A.; Mathur, S.; Miglio, A.; Mosser, B.; Nielsen, MB.; Serenelli, AM.; Aguirre, VS.; Themessl, N.
Title TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star Type
Year 2021 Publication Monthly Notices Of The Royal Astronomical Society Abbreviated Journal Mon. Not. Roy. Astron. Soc.
Volume 502 Issue 3 Pages 3704-3722
Keywords asteroseismology; techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planetary systems; stars: individual (TIC 200723869/TOI-257)
Abstract We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASA's Transiting Exoplanet Survey Satellite (TESS). The transit signal was detected by TESS and confirmed to be of planetary origin based on radial velocity observations. An analysis of the TESS photometry, the MINERVA-Australis, FEROS, and HARPS radial velocities, and the asteroseismic data of the stellar oscillations reveals that TOI-257b has a mass of M-P = 0.138 +/- 0.023M(J) (43.9 +/- 7.3 M-circle plus), a radius of R-P = 0.639 +/- 0.013 R-J (7.16 +/- 0.15 R-circle plus), bulk density of 0.65(-0.11)(+0.12) (cgs), and period 18.38818(-0.00084)(+0.00085) days. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M-* = 1.390 +/- 0.046(Msun), R-* = 1.888 +/- 0.033 R-sun, T-eff = 6075 +/- 90 K, and vsin i = 11.3 +/- 0.5 kms(-1). Additionally, we find hints for a second non-transiting sub-Saturn mass planet on a similar to 71 day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars (similar to 100) that have been characterized with asteroseismology. Warm sub-Saturns are rare in the known sample of exoplanets, and thus the discovery of TOI-257b is important in the context of future work studying the formation and migration history of similar planetary systems.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0035-8711 ISBN Medium
Area Expedition Conference
Notes WOS:000648998800038 Approved
Call Number UAI @ alexi.delcanto @ Serial 1397
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Author (up) Basu, S.; Yawar, A.; Concha, A.; Bandi, M.M.
Title On angled bounce-off impact of a drop impinging on a flowing soap film Type
Year 2017 Publication Fluid Dynamics Research Abbreviated Journal Fluid Dyn. Res.
Volume 49 Issue 6 Pages 19 pp
Keywords drop impact; soap film; interfacial flow; bouncing drops
Abstract Small drops impinging obliquely on thin flowing soap films frequently demonstrate the rare emergence of bulk elastic effects working in-tandem with the more commonplace hydrodynamic interactions. Three collision regimes are observable: (a) drop piercing through the film, (b) it coalescing with the flow, and (c) it bouncing off the film surface. During impact, the drop deforms along with a bulk elastic deformation of the film. For impacts that are close-to-tangential, the bounce-off regime predominates. We outline a reduced order analytical framework assuming a deformable drop and a deformable three-dimensional film, and the idealization invokes a phase-based parametric study. Angular inclination of the film and the ratio of post and pre-impact drop sizes entail the phase parameters. We also perform experiments with vertically descending droplets (constituted from deionized water) impacting against an inclined soap film, flowing under constant pressure head. Model-predicted phase domain for bounce-off compares well to our experimental findings. Additionally, the experiments exhibit momentum transfer to the film in the form of shed vortex dipoles, along with propagation of free surface waves. On consulting prior published work, we note that for locomotion of water-walking insects using an impulsive action, the momentum distribution to the shed vortices and waves are both significant, taking up respectively 2/3 and 1/3 of the imparted streamwise momentum. Considering the visually similar impulse actions, this theory, despite its assumption of a quiescent liquid bath of infinite depth, is applied to the drop bounce-off experiments, and the resultant shed vortex dipole momenta are compared to the momenta of the coherent vortex structures computed from particle imaging velocimetry data. The magnitudes reveal identical order (10(-7) N s), suggesting that notwithstanding the disparities, the bounce-off regime may be tapped as a toy analog for impulse-based interfacial biolocomotion.
Address [Basu, Saikat; Yawar, Ali; Bandi, M. M.] Okinawa Inst Sci & Technol, Grad Univ, Collect Interact Unit, Onna Son, Okinawa 9040495, Japan, Email: saikat_basu@med.unc.edu
Corporate Author Thesis
Publisher Iop Publishing Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0169-5983 ISBN Medium
Area Expedition Conference
Notes WOS:000415620000002 Approved
Call Number UAI @ eduardo.moreno @ Serial 789
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