Browsing by Author "Zapata, Abner"
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- ItemA hot Saturn on an eccentric orbit around the giant star K2-132(2018) Jones Fernández, Matías Ignacio; Zapata, Abner; Brahm Scott, Rafael; Espinoza, N.; Jordán Colzani, Andrés Cristóbal; Rojas Henríquez, Felipe; Rabus, Markus; Drass, Holger; Soto, M.G.; Jenkins, J.S.; Vuckovic, M.
- ItemBeryllium detection in the very fast nova ASASSN-16kt (V407 Lupi)(2018) Izzo, L.; Vanzi, Leonardo; Zapata, Abner; Fernández Rosso, Daniela.; Molaro, P.; Bonifacio, P.; Della Valle, M.; Cano, Z.; Ugarte Postigo, A. de; Prieto, José Luis.; Thöne, Christina C.
- ItemHD 1397b : A Transiting Warm Giant Planet Orbiting A V = 7.8 mag Subgiant Star Discovered by TESS(2019) Brahm Scott, Rafael; Espinoza Pérez, Néstor; Jordán Colzani, Andrés Cristóbal; Henning, T.; Sarkis, P.; Jones Fernández, Matías Ignacio; Diaz, M.R.; Jenkins, J.S.; Vanzi, Leonardo; Zapata, Abner; Petrovich Balbontín, Cristóbal; Kossakowski, D.; Rabus, Markus; Rojas, F.; Torres, P.
- ItemHD 1397b: a transiting warm giant planet orbiting a V = 7.8 mag sub-giant star discovered by TESS(2018) Brahm Scott, Rafael; Zapata, Abner; Jordán Colzani, Andrés Cristóbal; Vanzi, Leonardo; Rabus, Markus; Torres, Pascal
- ItemMASCARA-4 b/bRing-1b - A retrograde hot Jupiter around the bright A3V star HD 85628(2019) Brahm García, Enrique; Zapata, Abner; Jordán Colzani, Andrés Cristóbal; Vanzi, Leonardo; Dorval, P.; Talens, G.J.J.; Otten, G.P.P.L.; Henry, T.; Paredes, L.; Jao, W.C.; James, H.
- ItemTARdYS: Design and prototype of an exoplanet hunter for TAO using a R6 Echelle grating(2019) Rukdee, Surangkhana; Vanzi, Leonardo; Schwab, C.; Flores Cabrales, Mauricio Fabián; Valenzuela Navarro, Álvaro Enrique Hernán; Pember, J.; Zapata, Abner; Motohara, K.; Yoshii, Y.; Tala Pinto, M.One limitation in characterizing exoplanet candidates is the availability of infrared, high-resolution spectrographs. An important factor in the scarcity of high precision IR spectrographs is the high cost of these instruments. We present a new optical design, which leads to a cost-effective solution. Our instrument is a high-resolution (R = 60,000) infrared spectrograph with a R6 Echelle grating and an image slicer. We compare the best possible performance of quasi-Littrow and White Pupil setups, and prefer the latter because it achieves higher image quality. The instrument is proposed for the University of Tokyo Atacama Observatory (TAO) 6.5 m telescope in Chile. The Tao Aiuc high Resolution (d) Y band Spectrograph (TARdYS) covers 0.843-1.117 mu m. To reduce the cost, we squeeze 42 spectral orders onto a 1K detector with a semi-cryogenic solution. We obtain excellent resolution even when taking realistic manufacturing and alignment tolerances as well as thermal variations into account. In this paper, we present early results from the prototype of this spectrograph at ambient temperature.
- ItemThree Saturn-mass planets transiting F-type stars revealed with TESS and HARPS TOI-615b, TOI-622b, and TOI-2641b(2023) Psaridi, Angelica; Bouchy, Francois; Lendl, Monika; Akinsanmi, Babatunde; Stassun, Keivan G.; Smalley, Barry; Armstrong, David J.; Howard, Saburo; Ulmer-Moll, Solene; Grieves, Nolan; Barkaoui, Khalid; Rodriguez, Joseph E.; Bryant, Edward M.; Suarez, Olga; Guillot, Tristan; Evans, Phil; Attia, Omar; Wittenmyer, Robert A.; Yee, Samuel W.; Collins, Karen A.; Zhou, George; Galland, Franck; Parc, Lena; Udry, Stephane; Figueira, Pedro; Ziegler, Carl; Mordasini, Christoph; Winn, Joshua N.; Seager, Sara; Jenkins, Jon M.; Twicken, Joseph D.; Brahm, Rafael; Jones, Matias, I; Abe, Lyu; Addison, Brett T.; Briceno, Cesar I.; Briegal, Joshua; Collins, Kevin; Daylan, Tansu; Eigmueller, Phillip M.; Furesz, Gabor; Guerrero, Natalia; Hagelberg, Janis; Heitzmann, Alexis X.; Hounsell, Rebekah; Huang, Chelsea M.; Krenn, Andreas W.; Law, Nicholas; Mann, Andrew; McCormac, James; Mekarnia, Djamel D.; Mounzer, Dany; Nielsen, Louise R.; Osborn, Ares; Reinarz, Yared A.; Sefako, Ramotholo; Steiner, Michal I.; Strom, Paul A.; Triaud, Amaury H. M. J.; Vanderspek, Roland; Vanzi, Leonardo; Vines, Jose; Watson, Christopher; Wright, Duncan; Zapata, AbnerWhile the sample of confirmed exoplanets continues to grow, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stellar masses and study the impact of high irradiation on hot Jupiters orbiting such stars. We report the discovery of TOI-615b, TOI-622b, and TOI-2641b, three Saturn-mass planets transiting main sequence, F-type stars. The planets were identified by the Transiting Exoplanet Survey Satellite (TESS) and confirmed with complementary ground-based and radial velocity observations. TOI-615b is a highly irradiated (similar to 1277 F-circle dot) and bloated Saturn-mass planet (1.69(-0.06)(+0.05) R-Jup and 0.43(-0.08)(+0.09) M-Jup) in a 4.66 day orbit transiting a 6850 K star. TOI-622b has a radius of 0.82(-0.03)(+0.03) R-Jup and a mass of 0.30(-0.08)(+0.07) M-Jup in a 6.40 day orbit. Despite its high insolation flux (similar to 600 F-circle dot), TOI-622b does not show any evidence of radius inflation. TOI-2641b is a 0.39(-0.04)(+0.02) M-Jup planet in a 4.88 day orbit with a grazing transit (b = 1.04(-0.06)(+0.05)) that results in a poorly constrained radius of 1.61(-0.64)(+0.46) R-Jup. Additionally, TOI-615b is considered attractive for atmospheric studies via transmission spectroscopy with ground-based spectrographs and JWST. Future atmospheric and spin-orbit alignment observations are essential since they can provide information on the atmospheric composition, formation, and migration of exoplanets across various stellar types.
- ItemTwo simple image slicers for high resolution spectroscopy(2017) Tala Pinto, Marcelo Said; Zapata, Abner; Vanzi, Leonardo; Ávila, Gerardo; Guirao, Carlos; Pecchioli, E.; Pieralli, F.