Search Publications
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…
Asteroid absolute magnitudes and phase curve parameters from Gaia photometry
Cellino, A.; Muinonen, K.; Penttilä, A. +2 more
Aims: We perform light curve inversion for 491 asteroids to retrieve phase curve parameters, rotation periods, pole longitudes and latitudes, and convex and triaxial ellipsoid shapes by using the sparse photometric observations from Gaia Data Release 2 and the dense ground-based observations from the DAMIT database. We develop a method for th…
Bird's eye view of molecular clouds in the Milky Way. I. Column density and star formation from sub-parsec to kiloparsec scales
Kainulainen, Jouni; Spilker, Andri; Orkisz, Jan
Context. Describing how the properties of the interstellar medium are combined across various size scales is crucial for understanding star formation scaling laws and connecting Galactic and extragalactic data of molecular clouds.
Aims: We describe how the statistical structure of the clouds and its connection to star formation changes from s…
On the Use of Field RR Lyrae As Galactic Probes: IV. New Insights Into and Around the Oosterhoff Dichotomy
Salaris, M.; Lemasle, B.; Zoccali, M. +30 more
We discuss the largest and most homogeneous spectroscopic data set of field RR Lyrae variables (RRLs) available to date. We estimated abundances using both high-resolution and low-resolution (ΔS method) spectra for fundamental (RRab) and first overtone (RRc) RRLs. The iron abundances for 7941 RRLs were supplemented with similar estimates that are …
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…
First Solar Orbiter observation of the Alfvénic slow wind and identification of its solar source
André, N.; Fedorov, A.; Livi, S. +27 more
Context. Turbulence dominated by large-amplitude, nonlinear Alfvén-like fluctuations mainly propagating away from the Sun is ubiquitous in high-speed solar wind streams. Recent studies have demontrated that slow wind streams may also show strong Alfvénic signatures, especially in the inner heliosphere.
Aims: The present study focuses on the c…
Detectability of biosignatures on LHS 1140 b
Rauer, Heike; Sousa-Silva, Clara; Wunderlich, Fabian +4 more
Context. Terrestrial extrasolar planets around low-mass stars are prime targets when searching for atmospheric biosignatures with current and near-future telescopes. The habitable-zone super-Earth LHS 1140 b could hold a hydrogen-dominated atmosphere, and is an excellent candidate for detecting atmospheric features.
Aims: In this study we inv…