Dr. Astudillo-Defru, Nicola

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Dr. Astudillo-Defru, Nicola
Nombre completo
Astudillo Defru, Nicola
Facultad
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nastudillo@ucsc.cl
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20202
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Author: Collins, Karen A. × Subject: Planetary systems ×

Research Outputs

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Publication
    Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)
    (Astronomy & Astrophysics, 2020)
    Kemmer, J.
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    Stock, S.
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    Kossakowski, D.
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    Kaminski, A.
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    Molaverdikhani, K.
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    Schlecker, M.
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    Caballero, J. A.
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    Amado, P. J.
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    Astudillo-Defru, Nicola 
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    Bonfils, X.
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    Ciardi, David
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    Collins, Karen A.
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    Espinoza, N.
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    Fukui, A.
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    Hirano, T.
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    Jenkins, J. M.
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    Latham, D. W.
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    Matthews, E. C.
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    Narita, N.
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    Pallé, E.
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    Parviainen, H.
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    Quirrenbach, A.
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    Reiners, A.
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    Ribas, I.
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    Ricker, G.
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    Schlieder, J. E.
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    Seager, S.
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    Vanderspek, R.
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    Winn, J. N.
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    Almenara, José Manuel
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    Bejar, V. J. S.
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    Bluhm, P.
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    Bouchy, F.
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    Boyd, P.
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    Christiansen, J. L.
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    Cifuentes, C.
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    Cloutier, Ryan
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    Collins, Kevin I.
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    Cortés Contreras, M.
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    Crossfield, Ian J. M.
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    Crouzet, N.
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    de Leon, J. P.
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    Della Rose, D. D.
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    Delfosse, X.
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    Dreizler, S.
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    Esparza Borges, E.
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    Essack, Z.
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    Forveille, Th.
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    Figueira, P.
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    Galadí Enríquez, D.
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    Gan, T.
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    Glidden, A.
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    Gonzales, E. J.
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    Guerra, P.
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    Harakawa, H.
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    Hatzes, A. P.
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    Henning, Th.
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    Herrero, E.
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    Hodapp, K.
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    Hori, Y.
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    Howell, S. B.
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    Ikoma, M.
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    Isogai, K.
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    Jeffers, S. V.
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    Kürster, M.
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    Kawauchi, K.
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    Kimura, T.
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    Klagyivik, P.
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    Kotani, T.
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    Kurokawa, T.
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    Kusakabe, N.
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    Kuzuhara, M.
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    Lafarga, M.
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    Livingston, J. H.
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    Luque, R.
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    Matson, R.
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    Morales, J. C.
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    Mori, M.
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    Muirhead, P. S.
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    Murgas, F.
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    Nishikawa, J.
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    Nishiumi, T.
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    Omiya, M.
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    Reffert, S.
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    Rodríguez López, C.
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    Santos, N. C.
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    Schöfer, P.
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    Schwarz, R. P.
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    Shiao, B.
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    Tamura, M.
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    Terada, Y.
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    Twicken, J. D.
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    Ueda, A.
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    Vievard, S.
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    Watanabe, N.
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    Zechmeister, M.
    We present the confirmation and characterisation of GJ 3473 b (G 50–16, TOI-488.01), a hot Earth-sized planet orbiting an M4 dwarf star, whose transiting signal (P = 1.198 003 5 ± 0.000 001 8 d) was first detected by the Transiting Exoplanet Survey Satellite (TESS). Through a joint modelling of follow-up radial velocity observations with CARMENES, IRD, and HARPS together with extensive ground-based photometric follow-up observations with LCOGT, MuSCAT, and MuSCAT2, we determined a precise planetary mass, Mb = 1.86 ± 0.30 M⊕, and radius, Rb = 1.264 ± 0.050 R⊕. Additionally, we report the discovery of a second, temperate, non-transiting planet in the system, GJ 3473 c, which has a minimum mass, Mc sin i = 7.41 ± 0.91 M⊕, and orbital period, Pc = 15.509 ± 0.033 d. The inner planet of the system, GJ 3473 b, is one of the hottest transiting Earth-sized planets known thus far, accompanied by a dynamical mass measurement, which makes it a particularly attractive target for thermal emission spectroscopy.
  • No Thumbnail Available
    Publication
    A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS
    (EDP Sciences, 2020)
    Astudillo-Defru, Nicola 
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    Cloutier, Ryan
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    Wang, S. X.
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    Teske, J.
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    Brahm, R.
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    Hellier, C.
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    Ricker, G.
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    Vanderspek, R.
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    Latham, D.
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    Seager, S.
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    Winn, J. N.
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    Jenkins, J. M.
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    Collins, Karen A.
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    Stassun, K. G.
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    Ziegler, C.
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    Almenara, José Manuel
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    Anderson, David R.
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    Artigau, Étienne
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    Bonfils, X.
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    Bouchy, F.
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    Briceño, C.
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    Butler, R. P.
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    Charbonneau, D.
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    Conti, Dennis M.
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    Crane, J.
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    Crossfield, Ian J. M.
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    Davies, M.
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    Delfosse, X.
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    Díaz, R. F.
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    Doyon, R.
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    Dragomir, D.
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    Eastman, J. D.
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    Espinoza, N.
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    Essack, Z.
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    Feng, F.
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    Figueira, P.
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    Forveille, T.
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    Gan, T.
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    Glidden, A.
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    Guerrero, N.
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    Hart, R.
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    Henning, Th.
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    Horch, E. P.
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    Isopi, G.
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    Jenkins, J. S.
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    Jordán, A.
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    Kielkopf, J. F.
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    Law, N.
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    Lovis, C.
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    Mallia, F.
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    Mann, A. W.
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    De Medeiros, J. R.
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    Melo, C.
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    Mennickent, R. E.
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    Mignon, L.
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    Murgas. F.
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    Nusdeo, D. A.
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    Pepe, F.
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    Relles, H. M.
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    Rose, M.
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    Santos, N. C.
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    Ségransan, D.
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    Shectman, S.
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    Shporer, A.
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    Smith, J. C.
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    Torres, P.
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    Udry, S.
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    Villaseñor, J.
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    Winters, J. G.
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    Zhou, G.
    We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R⊕) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission. For confirmation and planet mass measurement purposes, this was followed up with ground-based photometry, seeing-limited and high-resolution imaging, and precise radial velocity (PRV) observations using the HARPS and Magellan/PFS spectrographs. By combining the TESS data and PRV observations, we find the mass of L 168-9 b to be 4.60 ± 0.56 M⊕ and thus the bulk density to be 1.74−0.33+0.44 times higher than that of the Earth. The orbital eccentricity is smaller than 0.21 (95% confidence). This planet is a level one candidate for the TESS mission’s scientific objective of measuring the masses of 50 small planets, and it is one of the most observationally accessible terrestrial planets for future atmospheric characterization.