D. Nespral

The wide binary frequency of metal-poor stars

Nicolas Lodieu, Antonio Pérez-Garrido, J.-Y. Zhang, E. L. Martín et autres

This study is aimed at identifying possible low-mass and sub-stellar companions to stars with well-determined metallicities. We investigate the multiplicity of metal-poor stars along with its impact on formation processes in the conditions of the early universe. Our goal is to look …

es (code pays fourni par la source)

The wide binary frequency of metal-poor stars

Nicolas Lodieu, Antonio Pérez-Garrido, J.-Y. Zhang, Eduardo L. Martín et autres

Context. This study is aimed at identifying possible low-mass and sub-stellar companions to stars with well-determined metallicities. We investigate the multiplicity of metal-poor stars along with its impact on formation processes in the conditions of the early universe. Aims. Our goal is …

es (code pays fourni par la source)

Detection of binary companions below the diffraction limit with lucky imaging

Miguel A. Cágigas, Rosa Clavero, Manuel Perez Cagigal, D. Nespral et autres

Context. Binary stars are invaluable tools that can be used to precisely measure the fundamental properties of stars, to test stellar models, and further our understanding of stellar evolution. Stellar binarity may also play an important role in the formation and evolution …

es, dk (code pays fourni par la source)

Detection of binary companions below the diffraction limit with lucky imaging

Miguel A. Cágigas, Rosa Clavero, Manuel Perez Cagigal, D. Nespral et autres

We provide a technique for resolving intermediate-separation binaries stars with medium-sized telescopes (i.e. diameter less than or equal to 2.5 m) at wavelengths around 825 nm in the super-resolution range (i.e. below the limit defined by the Rayleigh criterion). We combined two …

New Astronomical Observatory Design for the Detection and Tracking of Satellite Objects: The Satellite Robotic Observatory (SRO)

Francisco Angel Espartero Briceño, Javier Cubas, D. Nespral, Santiago Pindado

Robotic Astronomical Observatories (RAOs) have provided very good results in different research projects in astrophysics/astronomy. Their applications in the detection, tracking, and identification of near-Earth objects have contributed to the identification of potentially dangerous objects for our security, such as near-Earth Objects …

es (code pays fourni par la source)

TOI-954 b and K2-329 b: Short-period saturn-mass planets that test whether irradiation leads to inflation

H. Zhang, Johanna K Teske, S.R. Kane, Norio Narita et autres

We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, …

us (code pays fourni par la source)

K2-99: A subgiant hosting a transiting warm Jupiter in an eccentric orbit and a long-period companion

S. Grziwa, Ε. Πάλλη, Andrew W. Mann, D. Nespral et autres

We report the discovery from K2 of a transiting planet in an 18.25-d, eccentric (0.19 ± 0.04) orbit around K2-99, an 11th magnitude subgiant in Virgo. We con- firm the planetary nature of the companion with radial velocities, and determine that the …

us (code pays fourni par la source)

Sub-stellar companions of intermediate-mass stars with CoRoT: CoRoT–34b, CoRoT–35b, and CoRoT–36b

Daniel Sebastian, Eike W. Guenther, M. Deleuil, M. Dorsch et autres

ABSTRACT Theories of planet formation give contradicting results of how frequent close-in giant planets of intermediate mass stars (IMSs; $1.3\le M_{\star }\le 3.2\, \mathrm{M}_{\odot }$) are. Some theories predict a high rate of IMSs with close-in gas giants, while others predict a …

gb, de, fr, it, es, ch, nl, se, il (code pays fourni par la source)

The EURONEAR Lightcurve Survey of Near Earth Asteroids 2017–2020

O. Văduvescu, Amadeo Aznar Macías, Thomas G Wilson, Tarik Zegmott et autres

es, ro, gb, de, il, pl, cl (code pays fourni par la source)

Black Mirror: The impact of rotational broadening on the search for reflected light from 51 Pegasi b with high resolution spectroscopy

E. Spring, Jayne Birkby, Lorenzo Pino, R. Alonso et autres

Context. The extreme contrast ratios between stars and their planets at optical wavelengths make it challenging to isolate the light reflected by exoplanet atmospheres. Yet, these reflective properties reveal key processes occurring in the atmospheres, and they also span wavelengths that include …

nl, gb, us, it, es, fr, br (code pays fourni par la source)

VizieR Online Data Catalog: Photometric & spectroscopic obs. of TOI-954 and K2-329 (Sha+, 2021)

Lizhou Sha, Chelsea X. Huang, Avi Shporer, Joseph E. Rodriguez et autres

TOI-954 b and K2-329 b: Short-period Saturn-mass Planets that Test whether Irradiation Leads to Inflation

Lizhou Sha, Chelsea X. Huang, Avi Shporer, Joseph E. Rodriguez et autres

Abstract We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = …

us, cl, ch, ca, jp, au, fr, hu, gb, de, it, es, cn (code pays fourni par la source)