Search Publications
Rapid Bursts of Magnetically Gated Accretion in the Intermediate Polar V1025 Cen
Garnavich, Peter; Littlefield, Colin; Szkody, Paula +5 more
Magnetically gated accretion has emerged as a proposed mechanism for producing extremely short, repetitive bursts of accretion onto magnetized white dwarfs in intermediate polars (IPs), but this phenomenon has not been detected previously in a confirmed IP. We report the 27 day TESS light curve of V1025 Cen, an IP that shows a remarkable series of…
Breaking Orion's Veil with fossil outflows
Bally, J.; Goicoechea, J. R.; van der Tak, F. F. S. +3 more
Context. The role of feedback in the self-regulation of star formation is a fundamental question in astrophysics. The Orion Nebula is the nearest site of ongoing and recent massive star formation. It is a unique laboratory for the study of stellar feedback. Recent SOFIA [C II] 158 µm observations have revealed an expanding bubble, the Veil s…
The COS CGM Compendium. IV. Effects of Varying Ionization Backgrounds on Metallicity Determinations in the z < 1 Circumgalactic Medium
Fox, Andrew J.; Lehner, Nicolas; Howk, J. Christopher +3 more
Metallicity estimates of circumgalactic gas based on absorption-line measurements typically require photoionization modeling to account for unseen ionization states. We explore the impact of uncertainties in the extreme-ultraviolet background (EUVB) radiation on such metallicity determinations for the z < 1 circumgalactic medium. In particular,…
New XMM-Newton observations of faint, evolved supernova remnants in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Maggi, P. +5 more
The Large Magellanic Cloud (LMC) hosts a rich population of supernova remnants (SNRs), our knowledge of which is the most complete of any galaxy. However, there remain many candidate SNRs, identified through optical and radio observations where additional X-ray data can confirm their SNR nature and provide details on their physical properties. In …
Grain Alignment in the Circumstellar Shell of IRC+10° 216
Sandin, Christer; Soam, Archana; Hoang, Thiem +7 more
Dust-induced polarization in the interstellar medium (ISM) is due to asymmetric grains aligned with an external reference direction, usually the magnetic field. For both the leading alignment theories, the alignment of the grain's angular momentum with one of its principal axes and the coupling with the magnetic field requires the grain to be para…
A pilot ASKAP survey for radio transients towards the Galactic Centre
Bannister, Keith W.; Kaplan, David L.; Lenc, Emil +8 more
We present the results of a radio transient and polarization survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering $\sim 265\, {\rm deg}^2$ (350○ ≲ l ≲ 10○, |b| ≲ 10○).…
Deciphering stellar metallicities in the early Universe: case study of a young galaxy at z = 4.77 in the MUSE eXtremely Deep Field
Feltre, Anna; Bacon, Roland; Verhamme, Anne +8 more
Directly characterising the first generations of stars in distant galaxies is a key quest of observational cosmology. We present a case study of ID53 at z = 4.77, the UV-brightest (but L⋆) star-forming galaxy at z > 3 in the MUSE eXtremely Deep Field with a mass of ≈109 M⊙. In addition to very strong Lyman-α (Ly…
Two Massive Jupiters in Eccentric Orbits from the TESS Full-frame Images
Butler, R. Paul; Vanderburg, Andrew; Bieryla, Allyson +43 more
We report the discovery of two short-period massive giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS). Both systems, TOI-558 (TIC 207110080) and TOI-559 (TIC 209459275), were identified from the 30 minute cadence full-frame images and confirmed using ground-based photometric and spectroscopic follow-up observations from TESS's…
Radial velocity survey for planets around young stars (RVSPY). A transiting warm super-Jovian planet around HD 114082, a young star with a debris disk
Trifonov, Trifon; Henning, Thomas; Reffert, Sabine +7 more
Aims: We aim to detect planetary companions to young stars with debris disks via the radial velocity method.
Methods: We observed HD 114082 during April 2018-August 2022 as one of the targets of our RVSPY program (Radial Velocity Survey for Planets around Young stars). We use the FEROS spectrograph, mounted to the MPG/ESO 2.2 m telescope…
Starbursts with suppressed velocity dispersion revealed in a forming cluster at z = 2.51
Magnelli, B.; Daddi, E.; Elbaz, D. +19 more
One of the most prominent features of galaxy clusters is the presence of a dominant population of massive ellipticals in their cores. Stellar archaeology suggests that these gigantic beasts assembled most of their stars in the early Universe via starbursts. However, the role of dense environments and their detailed physical mechanisms in triggerin…