Navegação por Assunto "Brown dwarfs"

Resultados 1-9 de 9

    • Brown dwarf census with the Dark Energy Survey year 3 data and thethin disc scale height of early L types 

      Carnero Rosell, Aurelio; Santiago, Basilio Xavier; DES Collaboration (2019) [Artigo de periódico]
      In this paper we present a catalogue of 11 745 brown dwarfs with spectral types rangingfrom L0 to T9, photometrically classified using data from the Dark Energy Survey (DES)year 3 release matched to the Vista Hemisphere ...

    • A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary 

      Mack, C. E.; Ge, Jian; Deshpande, Rohit; Wisniewski, J.P.; Stassun, Keivan G.; Gaudi, B. S.; Fleming, S.W.; Mahadevan, Suvrath; De Lee, Nathan M.; Eastman, Jason; Ghezzi, Luan; González Hernández, Jonay I.; Femenía Castellá, B.; Ferreira, Letícia D.; Mello, Gustavo Frederico Porto de; Crepp, Justin R.; Mata Sánchez, Daniel; Agol, Eric; Beatty, Thomas G.; Bizyaev, D.; Brewington, Howard J.; Cargile, Phillip A.; Costa, Luiz N. da; Esposito, Massimiliano; Ebelke, Garrett L.; Hebb, Leslie; Jiang, Peng; Kane, Stephen R.; Lee, Brian L.; Maia, Marcio Antonio Geimba; Malanushenko, E.; Malanushenko, V.; Oravetz, Daniel J.; Paegert, Martin; Pan, K.; Allende Prieto, Carlos; Pepper, J.; Rebolo, Rafael; Roy, Arpita; Santiago, Basilio Xavier; Schneider, D.P.; Simmons, Audrey E.; Siverd, Robert J.; Snedden, S.A.; Tofflemire, Benjamin M. (2013) [Artigo de periódico]
      We report the discovery of a highly eccentric, double-lined spectroscopic binary star system (TYC 3010-1494-1), comprising two solar-type stars that we had initially identified as a single star with a brown dwarf companion. ...

    • Exploring the brown dwarf desert : new substellar companions from the SDSS-III MARVELS survey 

      Grieves, Nolan; Ge, Jian; Thomas, N.; Ma, Bo; Sithajan, Sirinrat; Ghezzi, Luan; Kimock, Benjamin; Willis, Kevin; De Lee, Nathan M.; Lee, Brian L.; Fleming, S.W.; Agol, Eric; Troup, Nicholas W.; Paegert, Martin; Schneider, D.P.; Stassun, Keivan G.; Városi, Frank; Zhao, Bo; Liu, Jian; Li, Rui; Mello, Gustavo Frederico Porto de; Bizyaev, D.; Pan, K.; Ferreira, Letícia D.; Lorenzo-Oliveira, Diego; Santiago, Basilio Xavier; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Ogando, Ricardo L.C.; Del Peloso, Eduardo Fernandez (2017) [Artigo de periódico]
      Planet searches using the radial velocity technique show a paucity of companions to solar-type stars within ∼5 au in the mass range of ∼10–80 MJup. This deficit, known as the brown dwarf desert, currently has no conclusive ...

    • Increasing the census of ultracool dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data 

      Dal Ponte, Marina; Santiago, Basilio Xavier; DES Collaboration (2020) [Artigo de periódico]
      We present the discovery of 255 binary and 6 multiple system candidates with wide (> 5 arcsec) separation composed by ultracool dwarfs (UCDs) companions to stars, plus nine double ultracool dwarf systems. These systems ...

    • Marvels-1 : a face-on double-lined binary star masquerading as a resonant planetary system and consideration of rare false positives in radial velocity planet searches 

      Wright, Jason Thomas; Roy, Arpita; Mahadevan, Suvrath; Wang, Sharon Xuesong; Ford, Eric B.; Payne, Matthew John; Lee, Brian L.; Wang, Ji; Crepp, Justin R.; Gaudi, B. S.; Eastman, Jason; Pepper, J.; Ge, Jian; Fleming, S.W.; Ghezzi, Luan; González Hernández, Jonay I.; Cargile, Phillip A.; Stassun, Keivan G.; Wisniewski, J.P.; Ferreira, Letícia D.; Mello, Gustavo Frederico Porto de; Maia, Marcio Antonio Geimba; Costa, Luiz N. da; Ogando, Ricardo L.C.; Santiago, Basilio Xavier; Schneider, D.P.; Hearty, Frederick R. (2013) [Artigo de periódico]
      We have analyzed new and previously published radial velocity (RV) observations of MARVELS-1, known to have an ostensibly substellar companion in a ∼6 day orbit. We find significant (∼100ms-ˡ) residuals to the best-fit ...

    • Search, spectral classification and benchmarking of brown dwarfs 

      Dal Ponte, Marina (2019) [Dissertação]
      Brown dwarfs are a very common type of object in our Galaxy, but due to their very low luminosity they rank among the hardest sources to detect. The known samples are still largely restricted to a distance of few tens of ...

    • Very low mass stellar and substellar companions to solar-like stars from MARVELS. IV. A candidate bronw dwarf or low-mass stellar companion HIP 67526 

      Jiang, Peng; Ge, Jian; Cargile, Phillip A.; Crepp, Justin R.; De Lee, Nathan M.; Mello, Gustavo Frederico Porto de; Esposito, Massimiliano; Ferreira, Letícia D.; Femenía Castellá, B.; Fleming, S.W.; Gaudi, B. S.; Ghezzi, Luan; González Hernández, Jonay I.; Hebb, Leslie; Lee, Brian L.; Ma, Bo; Stassun, Keivan G.; Wang, Ji; Wisniewski, J.P.; Agol, Eric; Bizyaev, D.; Brewington, Howard J.; Chang, Liang; Costa, Luiz N. da; Eastman, Jason; Ebelke, Garrett L.; Gary, Bruce L.; Kane, Stephen R.; Li, Rui; Liu, Jian; Mahadevan, Suvrath; Maia, Marcio Antonio Geimba; Malanushenko, V.; Malanushenko, E.; Muna, Demitri; Nguyen, D.C.; Ogando, Ricardo L.C.; Oravetz, Audrey; Oravetz, Daniel J.; Pan, K.; Pepper, J.; Paegert, Martin; Allende Prieto, Carlos; Rebolo, Rafael; Santiago, Basilio Xavier; Schneider, D.P.; Bradley, Alaina C. Shelden; Sivarani, Thirupathi; Snedden, S.A.; Van Eyken, Julian C.; Wan, Xiaoke; Weaver, Benjamin A.; Zhao, Bo (2013) [Artigo de periódico]
      We report the discovery of a candidate brown dwarf (BD) or a very low mass stellar companion (MARVELS-5b) to the star HIP 67526 from the Multi-object Apache point observatory Radial Velocity Exoplanet Large-area Survey ...

    • Very low mass stellar and substellar companions to solar-like stars from MARVELS. V. A low eccentricity brown dwarf from the driest part of the desert, marvels-6b 

      De Lee, Nathan M.; Ge, Jian; Crepp, Justin R.; Eastman, Jason; Esposito, Massimiliano; Femenía Castellá, B.; Fleming, S.W.; Gaudi, B. S.; Ghezzi, Luan; González Hernández, Jonay I.; Lee, Brian L.; Stassun, Keivan G.; Wisniewski, J.P.; Wood-Vasey, W.M.; Agol, Eric; Allende Prieto, Carlos; Barnes, Rory; Bizyaev, D.; Cargile, Phillip A.; Chang, Liang; Costa, Luiz N. da; Mello, Gustavo Frederico Porto de; Ferreira, Letícia D.; Gary, Bruce L.; Hebb, Leslie; Holtzman, J.A.; Liu, Jian; Ma, Bo; Mack, C. E.; Mahadevan, Suvrath; Maia, Marcio Antonio Geimba; Nguyen, D.C.; Oravetz, Audrey; Oravetz, Daniel J.; Paegert, Martin; Pan, K.; Pepper, J.; Malanushenko, E.; Malanushenko, V.; Rebolo, Rafael; Santiago, Basilio Xavier; Schneider, D.P.; Bradley, Alaina C. Shelden; Wan, Xiaoke; Wang, Ji; Zhao, Bo (2013) [Artigo de periódico]
      We describe the discovery of a likely brown dwarf (BD) companion with a minimum mass of 31.7 ± 2.0 MJup to GSC 03546-01452 from the MARVELS radial velocity survey, which we designate as MARVELS-6b. For reasonable priors, ...

    • Very-low-mass stellar and substellar companion to solar-like stars from MARVELS. III. A short-period brown dwarf cadidate around an active G0IV subgiant 

      Ma, Bo; Ge, Jian; Barnes, Rory; Crepp, Justin R.; De Lee, Nathan M.; Ferreira, Letícia D.; Esposito, Massimiliano; Femenía Castellá, B.; Fleming, S.W.; Gaudi, B. S.; Ghezzi, Luan; Hebb, Leslie; González Hernández, Jonay I.; Lee, Brian L.; Mello, Gustavo Frederico Porto de; Stassun, Keivan G.; Wang, Ji; Wisniewski, J.P.; Agol, Eric; Bizyaev, D.; Cargile, Phillip A.; Chang, Liang; Costa, Luiz N. da; Eastman, Jason; Gary, Bruce L.; Jiang, Peng; Kane, Stephen R.; Li, Rui; Liu, Jian; Mahadevan, Suvrath; Maia, Marcio Antonio Geimba; Muna, Demitri; Nguyen, D.C.; Ogando, Ricardo L.C.; Oravetz, Daniel J.; Pepper, J.; Paegert, Martin; Allende Prieto, Carlos; Rebolo, Rafael; Santiago, Basilio Xavier; Schneider, D.P.; Bradley, Alaina C. Shelden; Simmons, Audrey E.; Sivarani, Thirupathi; Van Eyken, Julian C.; Wan, Xiaoke; Weaver, Benjamin A.; Zhao, Bo (2013) [Artigo de periódico]
      We present an eccentric, short-period brown dwarf candidate orbiting the active, slightly evolved subgiant star TYC 2087-00255-1, which has effective temperature Teff = 5903±42 K, surface gravity log(g) = 4.07±0.16 (cgs), ...