Search Publications
Comparison of Gaia and Hipparcos parallaxes of close visual binary stars and the impact on determinations of their masses
Hussein, Abdallah M.; Al-Wardat, Mashhoor Ahmad; Al-Naimiy, Hamid M. +1 more
Precise measurement of the fundamental parameters of stellar systems, including mass and radius, depends critically on how well the stellar distances are known. Astrometry from space provides parallax measurements of unprecented accuracy, from which distances can be derived, initially from the Hipparcos mission, with a further refinement of that a…
The formation of planetary systems with SPICA
Waters, L. B. F. M.; Kamp, I.; Wolf, S. +37 more
In this era of spatially resolved observations of planet-forming disks with Atacama Large Millimeter Array (ALMA) and large ground-based telescopes such as the Very Large Telescope (VLT), Keck, and Subaru, we still lack statistically relevant information on the quantity and composition of the material that is building the planets, such as the tota…
Mid-IR cosmological spectrophotometric surveys from space: Measuring AGN and star formation at the cosmic noon with a SPICA-like mission
Bisigello, Laura; Kohno, Kotaro; Alonso-Herrero, Almudena +31 more
We use the SPace Infrared telescope for Cosmology and Astrophysics (SPICA) project as a template to demonstrate how deep spectrophotometric surveys covering large cosmological volumes over extended fields (1–$15\, \rm{deg^2}$) with a mid-IR imaging spectrometer (17–$36\, \rm{\rm{\upmu m}}$) in conjunction with deep$70\, \rm{\rm{\upmu m}}$photometr…
HD 76920 b pinned down: A detailed analysis of the most eccentric planetary system around an evolved star
Mustill, A. J.; Wittenmyer, R. A.; Pollard, K. R. +9 more
We present 63 new multi-site radial velocity (RV) measurements of the K1III giant HD 76920, which was recently reported to host the most eccentric planet known to orbit an evolved star. We focused our observational efforts on the time around the predicted periastron passage and achieved near-continuous phase coverage of the corresponding RV peak. …
The nature and likely redshift of GLEAM J0917-0012
Lehnert, Matthew D.; Stern, Daniel; De Breuck, Carlos +10 more
We previously reported a putative detection of a radio galaxy at $z=10.15$ , selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The redshift of this source, GLEAM J0917-0012, was based on three weakly detected molecular emission lines observed with the Atacama Large Millimetre Array (ALMA). In order to c…
The role of SPICA-like missions and the Origins Space Telescope in the quest for heavily obscured AGN and synergies with Athena
Pozzi, F.; Rodighiero, G.; Feltre, A. +21 more
In the black hole (BH)-galaxy co-evolution framework, most of the star formation (SF) and the BH accretion are expected to take place in highly obscured conditions. The large amount of gas and dust absorbs most of the UV-to-soft-X radiation and re-emits it at longer wavelengths, mostly in the IR. Thus, obscured active galactic nuclei (AGN) are ver…
Gaia EDR3 parallaxes of type I X-ray bursters and their implications on the models of type I X-ray bursts: A generic approach to the Gaia parallax zero point and its uncertainty
Deller, Adam T.; Miller-Jones, James C. A.; Ding, Hao
Light curves of photospheric radius expansion (PRE) bursts, a subset of type I X-ray bursts, have been used as standard candles to estimate the `nominal PRE distances' for 63% of PRE bursters (bursters), assuming PRE burst emission is spherically symmetric. Model-independent geometric parallaxes of bursters provide a valuable chance to test models…
Updated studies on exomoons in the HD 23079 system
Cuntz, M.; Jagtap, O.; Quarles, B.
We re-evaluate the outer edge of orbital stability for possible exomoons orbiting the radial velocity planet discovered in the HD 23079 system. In this system, a solar-type star hosts a Jupiter-mass planet in a nearly circular orbit in the outer stellar habitable zone. The outer stability limit of exomoons is deduced using N-body and tidal migrati…
Processing GOTO data with the Rubin Observatory LSST Science Pipelines I: Production of coadded frames
Ulaczyk, K.; Pallé, E.; Rol, E. +44 more
The past few decades have seen the burgeoning of wide-field, high-cadence surveys, the most formidable of which will be the Legacy Survey of Space and Time (LSST) to be conducted by the Vera C. Rubin Observatory. So new is the field of systematic time-domain survey astronomy; however, that major scientific insights will continue to be obtained usi…
Simulating infrared spectro-photometric surveys with a SPRITZ
Pozzi, F.; Rodighiero, G.; Schaerer, D. +19 more
Mid- and far-infrared (IR) photometric and spectroscopic observations are fundamental to a full understanding of the dust-obscured Universe and the evolution of both star formation and black hole accretion in galaxies. In this work, using the specifications of the SPace Infrared telescope for Cosmology and Astrophysics (SPICA) as a baseline, we in…