Search Publications
A Bayesian model for inferring properties of the local white dwarf population in astrometric and photometric surveys
Peiris, Hiranya V.; Widmark, Axel; Mortlock, Daniel J.
The Gaia mission is providing precise astrometry for an unprecedented number of white dwarfs (WDs), encoding information on stellar evolution, Type Ia supernovae progenitor scenarios, and the star formation and dynamical history of the Milky Way. With such a large data set, it is possible to infer properties of the WD population using only astrome…
SAPREMO: a simplified algorithm for predicting detections of electromagnetic transients in surveys
Stratta, G.; Branchesi, M.; Ciolfi, R. +3 more
The multiwavelength detection of GW170817 has inaugurated multimessenger astronomy. The next step consists in interpreting observations coming from population of gravitational wave sources. We introduce SAPREMO, a tool aimed at predicting the number of electromagnetic signals characterized by a specific light curve and spectrum, expected in a part…
Two temperate sub-Neptunes transiting the star EPIC 212737443
Livingston, John H.; Dominik, Martin; Hernández, Jesús +11 more
We report the validation of a new planetary system around the K3 star EPIC 212737443 using a combination of K2 photometry, follow-up high-resolution imaging and spectroscopy. The system consists of two sub-Neptune sized transiting planets with radii of 2.6R⊕ and 2.7R⊕, with orbital periods of 13.6 and 65.5 d, equilibrium temp…
Validation of a temperate fourth planet in the K2-133 multiplanet system
Poppenhaeger, K.; Wells, R.; Watson, C. A.
We present follow-up observations of the K2-133 multiplanet system. Previously, we announced that K2-133 contained three super-Earths orbiting an M1.5V host star - with tentative evidence of a fourth outer-planet orbiting at the edge of the temperate zone. Here, we report on the validation of the presence of the fourth planet, determining a radius…
Cassini CIRS and ISS opposition effects of Saturn's rings - I. C ring narrow or broad surge?
Déau, E.; Colwell, J. E.; El Moutamid, M. +6 more
We focus on the thermal and optical opposition effects of Saturn's C ring seen by Cassini CIRS (Composite InfraRed Spectrometer) at 15.7 {µ}m and ISS (Imaging Science Subsystem) at 0.6 {µ}m. The opposition surge is a brightness peak observed at low phase angle (α → 0°). Saturn rings' opposition surge was recently observed in reflected …
The dynamics of the outer edge of Saturn's A ring perturbed by the satellites Janus and Epimetheus
Cooper, N. J.; Murray, C. D.; El Moutamid, M. +4 more
We present an analytical model to study the dynamics of the outer edge of Saturn's A ring. The latter is influenced by 7:6 mean motion resonances with Janus and Epimetheus. Because of the horseshoe motion of the two co-orbital moons, the ring edge particles are alternately trapped in a corotation eccentricity resonance (CER) or a Lindblad eccentri…
New outburst from the luminous supersoft source SSS1 in NGC 300 with periodic modulation
Haberl, F.; Maitra, C.; Carpano, S.
The nearby galaxy NGC 300 is hosting two luminous transient supersoft X-ray sources with bolometric luminosities above 3 × 1038 erg s-1, assuming simple blackbody spectra with temperatures around 60-70 eV. For one of these, SSS1, a periodic modulation of 5.4 h was observed in an XMM-Newton observation from 2001 Jan…
Neutral-gas-phase metal abundances in Zn II-selected quasar absorption line systems near redshift z = 1.2
Turnshek, David A.; Rao, Sandhya M.; Monier, Eric M. +2 more
We present 10 metallicity measurements for quasar absorbers near z = 1.2 that were selected for having unusually significant Zn II absorption in their Sloan Digital Sky Survey (SDSS) spectra. Follow-up UV space spectroscopy of the Lyα region shows that all 10 have damped Lyα (DLA) absorption, corresponding to neutral hydrogen column densities in t…
SB 796: a high-velocity RRc star
Soszyński, Igor; Gomel, Roy; Faigler, Simchon +6 more
We report here on a detailed study of a c-type RR Lyrae variable (RRc variable), SB 796, serendipitously discovered in a search of the WASP public data for stars that display large photometric periodic modulation. SB 796 displays a period of P = 0.26585 d and semi-amplitude of ∼0.1 mag. Comparison of the modulation shape and period with the detail…
The Sejong Open cluster Survey (SOS) VI. A small star-forming region in the high Galactic latitude molecular cloud MBM 110
Song, Inseok; Bessell, Michael S.; Sung, Hwankyung
We present optical photometric, spectroscopic data for the stars in the high Galactic latitude molecular cloud MBM 110. For the complete membership selection of MBM 110, we also analyse Wide-field Infrared Survey Explorer(WISE) mid-infrared data and Gaia astrometric data. Membership of individual stars is critically evaluated using the data mentio…