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A SkyMapper view of the Large Magellanic Cloud: the dynamics of stellar populations
Lewis, Geraint F.; Ibata, Rodrigo A.; Mackey, Dougal +2 more
We present the first SkyMapper stellar population analysis of the Large Magellanic Cloud (hereafter LMC), including the identification of 3578 candidate Carbon Stars through their extremely red g - r colours. Coupled with Gaia astrometry, we analyse the distribution and kinematics of this Carbon Star population, finding the LMC to be centred at (R…
Location and Setting of the Mars InSight Lander, Instruments, and Landing Site
Golombek, M.; Warner, N. H.; Williams, N. +23 more
Knowing precisely where a spacecraft lands on Mars is important for understanding the regional and local context, setting, and the offset between the inertial and cartographic frames. For the InSight spacecraft, the payload of geophysical and environmental sensors also particularly benefits from knowing exactly where the instruments are located. A…
Moderate-resolution K-band Spectroscopy of Substellar Companion κ Andromedae b
Macintosh, Bruce; Barman, Travis S.; Marois, Christian +5 more
We present moderate-resolution (R ∼ 4000) K-band spectra of the "super-Jupiter," κ Andromedae b. The data were taken with the OSIRIS integral field spectrograph at Keck Observatory. The spectra reveal resolved molecular lines from H2O and CO, and are compared to a custom PHOENIX atmosphere model grid appropriate for young planetary-mass…
An Updated Visual Orbit of the Directly Imaged Exoplanet 51 Eridani b and Prospects for a Dynamical Mass Measurement with Gaia
Duchêne, Gaspard; Esposito, Thomas M.; Hom, Justin +51 more
We present a revision to the visual orbit of the young, directly imaged exoplanet 51 Eridani b using four years of observations with the Gemini Planet Imager. The relative astrometry is consistent with an eccentric (e={0.53}-0.13+0.09) orbit at an intermediate inclination (i={136}-11+10 °), although circ…
Astrophysical Distance Scale. II. Application of the JAGB Method: A Nearby Galaxy Sample
Madore, Barry F.; Freedman, Wendy L.
We apply the near-infrared J-region asymptotic giant branch (JAGB) method, recently introduced by Madore & Freedman, to measure the distances to 14 nearby galaxies out to 4 Mpc. We use the geometric detached eclipsing binary (DEB) distances to the LMC and SMC as independent zero-point calibrators. We find excellent agreement with previously pu…
Blue straggler populations of seven open clusters with Gaia DR2
Vaidya, Kaushar; Rao, Khushboo K.; Agarwal, Manan +1 more
Blue straggler stars (BSS) are well studied in globular clusters but their systematic study with secure membership determination is lacking in open clusters. We use Gaia DR2 data to determine accurate stellar membership for four intermediate-age open clusters, namely Melotte 66, NGC 2158, NGC 2506, and NGC 6819, and three old open clusters, namely…
Period-luminosity-metallicity relation of classical Cepheids
Clementini, G.; Ripepi, V.; Molinaro, R. +7 more
Context. Classical Cepheids (DCEPs) are the most important primary indicators for the extragalactic distance scale. Establishing the dependence on metallicity of their period-luminosity and period-Wesenheit (PL and PW) relations has deep consequences for the estimate of the Hubble constant (H0).
Aims: We investigate the dependence …
Survey of planetesimal belts with ALMA: gas detected around the Sun-like star HD 129590
Kral, Quentin; Wyatt, Mark C.; Kennedy, Grant M. +2 more
Gas detection around main-sequence stars is becoming more common with around 20 systems showing the presence of CO. However, more detections are needed, especially around later spectral type stars to better understand the origin of this gas and refine our models. To do so, we carried out a survey of 10 stars with predicted high likelihoods of seco…
Radial Velocity Photon Limits for the Dwarf Stars of Spectral Classes F-M
Reiners, Ansgar; Zechmeister, Mathias
The determination of extrasolar planet masses with the radial velocity (RV) technique requires spectroscopic Doppler information from the planet's host star, which varies with stellar brightness and temperature. We analyze the Doppler information in spectra from dwarfs of spectral types F-M utilizing empirical information from HARPS and CARMENES d…
KELT-11 b: Abundances of Water and Constraints on Carbon-bearing Molecules from the Hubble Transmission Spectrum
Tsiaras, A.; Waldmann, I. P.; Tinetti, G. +4 more
In the past decade, the analysis of exoplanet atmospheric spectra has revealed the presence of water vapor in almost all the planets observed, with the exception of a fraction of overcast planets. Indeed, water vapor presents a large absorption signature in the wavelength coverage of the Hubble Space Telescope's (HST) Wide Field Camera 3 (WFC3), w…