Search Publications
Linear bias forecasts for emission line cosmological surveys
Merson, Alexander; Smith, Alex; Benson, Andrew +2 more
We forecast the linear bias for Hα-emitting galaxies at high redshift. To simulate a Euclid-like and a WFIRST-like survey, we place galaxies into a large-volume dark matter halo lightcone by sampling a library of luminosity-dependent halo occupation distributions (HODs), which is constructed using a physically motivated galaxy formation model. We …
A Gaia view of the two OB associations Cygnus OB2 and Carina OB1: the signature of their formation process
Lim, Beomdu; Nazé, Yaël; Gosset, Eric +1 more
OB associations are the prime star-forming sites in galaxies. However, the detailed formation process of such stellar systems still remains a mystery. In this context, identifying the presence of substructures may help in tracing the footprints of their formation process. Here, we present a kinematic study of the two massive OB associations Cygnus…
The compact multiple system HIP 41431
Molnár, L.; Latham, D. W.; Tokovinin, A. +4 more
The nearby (50 pc) K7V dwarf HIP 41431 (EPIC 212096658) is a compact three-tier hierarchy. Three K7V stars with similar masses, from 0.61 to 0.63 solar, make a triple-lined spectroscopic system where the inner binary with a period of 2.9 d is eclipsing, and the outer companion on a 59-d orbit exerts strong dynamical influence revealed by the eclip…
K2-290: a warm Jupiter and a mini-Neptune in a triple-star system
Kuzuhara, M.; Alonso, R.; Deeg, H. +41 more
We report the discovery of two transiting planets orbiting K2-290 (EPIC 249624646), a bright (V = 11.11) late F-type star residing in a triple-star system. It was observed during Campaign 15 of the K2 mission, and in order to confirm and characterize the system, follow-up spectroscopy and AO imaging were carried out using the FIES, HARPS, HARPS-N,…
Long-term evolutions of the cyclotron line energies in Her X-1, Vela X-1, and Cen X-3 as observed with Swift/BAT
Santangelo, A.; Ducci, L.; Zhang, S. +3 more
We study the long-term evolution of the centroid energy of cyclotron lines - often referered to as cyclotron resonance scattering features (CRSFs) - in Her X-1, Vela X-1, and Cen X-3, using survey observations of the Burst Alert Telescope onboard Swift. We find a significant decrease of the fundamental CRSF energy in Her X-1 and the first harmonic…
Seismic modelling of early B-type pulsators observed by BRITE - I. θ Ophiuchi
Moffat, Anthony F. J.; Pablo, Herbert; Walczak, Przemysław +8 more
We analyse time-series observations from the BRITE-Constellation of the well-known β Cephei type star θ Ophiuchi. Seven previously known frequencies were confirmed and 19 new frequency peaks were detected. In particular, high-order g modes, typical for the SPB (Slowly Pulsating B-type star) pulsators, are uncovered. These low-frequency modes are a…
A search for gravitationally lensed quasars and quasar pairs in Pan-STARRS1: spectroscopy and sources of shear in the diamond 2M1134-2103
Fassnacht, Christopher D.; Chen, Geoff C. -F.; Nelson, George J. +4 more
We present results of a systematic search for gravitationally lensed quasars in Pan-STARRS1. Our final sample of candidates comprises of 91 systems, not including 25 rediscovered lensed quasars and quasar pairs. In the absence of spectroscopy to verify the lensing nature of the candidates, the main sources of contaminants are likely to be quasar p…
Resolved scaling relations and metallicity gradients on sub-kiloparsec scales at z ≈ 1
Mahler, G.; Richard, J.; Nanayakkara, T. +9 more
The existence of a spatially resolved star-forming main sequence (rSFMS) and a spatially resolved mass-metallicity relation (rMZR) is now well established for local galaxies. Moreover, gradients with metallicity decreasing with radius seem to be common in local disc galaxies. These observations suggest that galaxy formation is a self-regulating pr…
Interstellar polarization and extinction in the Local Bubble and the Gould Belt
Gontcharov, George A.; Mosenkov, Aleksandr V.
We analyse an all-sky compilation of 13 data sources with optical interstellar linear polarization for 3871 Gaia DR2 and Hipparcos stars within 500 pc, which do not exhibit a considerable intrinsic polarization. These data are analysed together with five 3D maps and models of the reddening E(B - V). We consider variations of the polarization degre…
TOI-150b and TOI-163b: two transiting hot Jupiters, one eccentric and one inflated, revealed by TESS near and at the edge of the JWST CVZ
Henning, Thomas; Kürster, Martin; Jordán, Andrés +51 more
We present the discovery of TYC9191-519-1b (TOI-150b, TIC 271893367) and HD271181b (TOI-163b, TIC 179317684), two hot Jupiters initially detected using 30-min cadence Transiting Exoplanet Survey Satellite (TESS) photometry from Sector 1 and thoroughly characterized through follow-up photometry (CHAT, Hazelwood, LCO/CTIO, El Sauce, TRAPPIST-S), hig…