Search Publications
The delay time distribution of Type-Ia supernovae in galaxy clusters: the impact of extended star-formation histories
Maoz, Dan; Freundlich, Jonathan
The delay time distribution (DTD) of Type-Ia supernovae (SNe Ia) is important for understanding chemical evolution, SN Ia progenitors, and SN Ia physics. Past estimates of the DTD in galaxy clusters have been deduced from SN Ia rates measured in cluster samples observed at various redshifts, corresponding to different time intervals after a presum…
Kinematic constraints on spatial curvature from supernovae Ia and cosmic chronometers
Malheiro, M.; Jesus, J. F.; Valentim, R. +1 more
An approach to estimate the spatial curvature Ωk from data independently of dynamical models is suggested, through kinematic parametrizations of the comoving distance [DC(z)] with third-degree polynomial, of the Hubble parameter [H(z)] with a second-degree polynomial and of the deceleration parameter [q(z)] with first-order p…
ALMA survey of Lupus class III stars: Early planetesimal belt formation and rapid disc dispersal
Testi, L.; Tazzari, M.; Williams, J. P. +9 more
Class III stars are those in star forming regions without large non-photospheric infrared emission, suggesting recent dispersal of their protoplanetary discs. We observed 30 class III stars in the 1-3 Myr Lupus region with ALMA at ∼856µm, resulting in four detections that we attribute to circumstellar dust. Inferred dust masses are 0.036-0.0…
Cloud-by-cloud, multiphase, Bayesian modelling: application to four weak, low-ionization absorbers
Richter, Philipp; Charlton, Jane C.; Kacprzak, Glenn G. +8 more
We present a new method aimed at improving the efficiency of component by component ionization modelling of intervening quasar absorption-line systems. We carry out cloud-by-cloud, multiphase modelling making use of CLOUDY and Bayesian methods to extract physical properties from an ensemble of absorption profiles. Here, as a demonstration of metho…
Circumbinary and circumstellar discs around the eccentric binary IRAS 04158+2805 - a testbed for binary-disc interaction
Duchêne, Gaspard; Ménard, François; Stapelfeldt, Karl +10 more
IRAS 04158+2805 has long been thought to be a very low mass T-Tauri star (VLMS) surrounded by a nearly edge-on, extremely large disc. Recent observations revealed that this source hosts a binary surrounded by an extended circumbinary disc with a central dust cavity. In this paper, we combine ALMA multiwavelength observations of continuum and …
High tide: a systematic search for ellipsoidal variables in ASAS-SN
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +5 more
The majority of non-merging stellar mass black holes are discovered by observing high energy emission from accretion processes. Here, we pursue the large, but still mostly unstudied population of non-interacting black holes and neutron stars by searching for the tidally induced ellipsoidal variability of their stellar companions. We start from a s…
Solo dwarfs - III. Exploring the orbital origins of isolated Local Group galaxies with Gaia Data Release 2
Lewis, Geraint F.; McConnachie, Alan W.; Venn, Kim A. +4 more
We measure systemic proper motions for distant dwarf galaxies in the Local Group and investigate if these isolated galaxies have ever had an interaction with the Milky Way or M31. We cross-match photometry of isolated, star-forming, dwarf galaxies in the Local Group, taken as part of the Solo survey, with astrometric measurements from Gaia Data Re…
Assessment of the cosmic distance duality relation using Gaussian process
Mukherjee, Ankan; Mukherjee, Purba
Two types of distance measurement are important in cosmological observations, the angular diameter distance dA and the luminosity distance dL. In this work, we carried out an assessment of the theoretical relation between these two distance measurements, namely the cosmic distance-duality relation, from type Ia supernova (SN-…
New optically identified supernova remnants in the Large Magellanic Cloud
Maitra, Chandreyee; Sasaki, Manami; Alsaberi, Rami Z. E. +20 more
We present a new optical sample of three Supernova Remnants (SNRs) and 16 Supernova Remnant (SNR) candidates in the Large Magellanic Cloud (LMC). These objects were originally selected using deep H α, [S II], and [O III] narrow-band imaging. Most of the newly found objects are located in less dense regions, near or around the edges of the LMC's ma…
A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020
Handler, G.; Vanderburg, A.; Saio, H. +13 more
We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary eclipses with an orbital period of 1.1057 d, and δ Scuti-type pulsations with a mode frequency of 21.09533 d-1. This pulsation exhibits a septuplet of orbital sidelobes as well as a harmonic quintuplet. Using th…