Zobrazeno 1 - 10
of 184
pro vyhledávání: '"S. K. Leggett"'
Autor:
S. K. Leggett, Pascal Tremblin
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 86 (2023)
The James Webb Space Telescope (JWST) is now observing Y dwarfs, the coldest known brown dwarfs, with effective temperatures T _eff ≲ 475 K. The first published observations provide important information: not only is the atmospheric chemistry out o
Externí odkaz:
https://doaj.org/article/0348c71591f94629bed519667a0df6f6
Autor:
Aaron M. Meisner, S. K. Leggett, Sarah E. Logsdon, Adam C. Schneider, Pascal Tremblin, Mark Phillips
Publikováno v:
The Astronomical Journal, Vol 166, Iss 2, p 57 (2023)
Mapping out the populations of thick disk and halo brown dwarfs is important for understanding the metallicity dependence of low-temperature atmospheres and the substellar mass function. Recently, a new population of cold and metal-poor brown dwarfs
Externí odkaz:
https://doaj.org/article/7f47ed8497a040a885c0e54a095255db
Autor:
Dylan Owens, Siyi Xu, Elena Manjavacas, S. K. Leggett, S. L. Casewell, Erik Dennihy, Patrick Dufour, Beth L. Klein, Sherry Yeh, B. Zuckerman
Publikováno v:
The Astronomical Journal, Vol 166, Iss 1, p 5 (2023)
Excess infrared flux from white dwarf stars is likely to arise from a dusty debris disk or a cool companion. In this work, we present near-infrared spectroscopic observations with Keck/MOSFIRE, Gemini/GNIRS, and Gemini/Flamingos-2 of seven white dwar
Externí odkaz:
https://doaj.org/article/f24d0633bfb34e4db49d68e2608ce78c
We present a spectro-photometric analysis of 2880 cool white dwarfs within 100 pc of the Sun and cooler than Teff = 10,000 K, with grizy Pan-STARRS photometry and Gaia trigonometric parallaxes available. We also supplement our data sets with near-inf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77552e305f53caa4d759c72cda7f39fc
A recent analysis of the 100 pc white dwarf sample in the SDSS footprint demonstrated for the first time the existence of a well defined ultracool -- or IR-faint -- white dwarf sequence in the Hertzsprung-Russell diagram. Here we take advantage of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::76aa5965e167ae5671a843bd409d9299
Autor:
Siyi Xu, Hannah Diamond-Lowe, Ryan J. MacDonald, Andrew Vanderburg, Simon Blouin, P. Dufour, Peter Gao, Laura Kreidberg, S. K. Leggett, Andrew W. Mann, Caroline V. Morley, Andrew W. Stephens, Christopher E. O’Connor, Pa Chia Thao, Nikole K. Lewis
Publikováno v:
Xu, S, Diamond-Lowe, H, MacDonald, R J, Vanderburg, A, Blouin, S, Dufour, P, Gao, P, Kreidberg, L, Leggett, S K, Mann, A W, Morley, C V, Stephens, A W, O’Connor, C E, Thao, P C & Lewis, N K 2021, ' Gemini/GMOS Transmission Spectroscopy of the Grazing Planet Candidate WD 1856+534 b ', Astronomical Journal, vol. 162, no. 6, 296 . https://doi.org/10.3847/1538-3881/ac2d26
WD 1856+534 b is a Jupiter-sized, cool giant planet candidate transiting the white dwarf WD 1856+534. Here, we report an optical transmission spectrum of WD 1856+534 b obtained from ten transits using the Gemini Multi-Object Spectrograph. This system
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a99e29db540519cf31c61dd7f8d15570
Autor:
Samuel Lai, Erik Dennihy, Siyi Xu, Atsuko Nitta, Scot Kleinman, S. K. Leggett, Amy Bonsor, Simon Hodgkin, Alberto Rebassa-Mansergas, Laura K. Rogers
Publikováno v:
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Digital.CSIC. Repositorio Institucional del CSIC
instname
Universitat Politècnica de Catalunya (UPC)
Digital.CSIC. Repositorio Institucional del CSIC
instname
Infrared excesses around white dwarf stars indicate the presence of various astrophysical objects of interest, including companions and debris disks. In this second paper of a series, we present follow-up observations of infrared excess candidates fr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f7cdacaaaeb9413e6090da16ca37ed7
https://www.repository.cam.ac.uk/handle/1810/327117
https://www.repository.cam.ac.uk/handle/1810/327117
Publikováno v:
Leggett, S K, Cross, N J G & Hambly, N C 2020, ' Faint Standards for ZYJHK from the UKIDSS and VISTA Surveys ', Monthly Notices of the Royal Astronomical Society, vol. 493, no. 2, pp. 2568-2595 . https://doi.org/10.1093/mnras/staa310
The currently defined "UKIRT Faint Standards" have JHK magnitudes between 10 and 15, with K_median=11.2. These stars will be too bright for the next generation of large telescopes. We have used multi-epoch observations taken as part of the UKIRT Infr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b4fe14d541a38bd318535b888c10d83
Publikováno v:
The Astrophysical Journal. 920:99
We present $Spitzer$ IRS 5--14 $\mu$m spectra and 16 $\mu$m and 22 $\mu$m photometry of the T2.5 companion to the $\sim$300 Myr-old G0V star HN Peg. We incorporate previous 0.8--5 $\mu$m observations to obtain the most comprehensive spectral energy d
Autor:
J. Sebastian Pineda, Caroline Morley, S. K. Leggett, Daniel Apai, William M. J. Best, Marcia J. Rieke, Sarah L. Casewell, Gillian S. Wright, Michael C. Liu, John E. Gizis, Trent J. Dupuy, Thomas R. Geballe, Mark S. Marley
Half of the energy emitted by late-T- and Y-type brown dwarfs emerges at 3.5 < lambda um < 5.5. We present new L' (3.43 < lambda um < 4.11) photometry obtained at the Gemini North telescope for nine late-T and Y dwarfs, and synthesize L' from spectra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84a5879ddef501ebd50a78df28a76b5f