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Diffuse interstellar bands in Gaia DR3 RVS spectra. New measurements based on machine learning
Schultheis, M.; Zwitter, T.; Zhao, H. +1 more
Diffuse interstellar bands (DIBs) are weak and broad interstellar absorption features in astronomical spectra that originate from unknown molecules. To measure DIBs in spectra of late-type stars more accurately and more efficiently, we developed a random forest model to isolate the DIB features from the stellar components. We applied this method t…
The β Pictoris b Hill sphere transit campaign. II. Searching for the signatures of the β Pictoris exoplanets through time delay analysis of the δ Scuti pulsations
Mamajek, Eric; Stevenson, Kevin B.; Kalas, Paul +34 more
The β Pictoris system is the closest known stellar system with directly detected gas giant planets, an edge-on circumstellar disc, and evidence of falling sublimating bodies and transiting exocomets. The inner planet, β Pictoris c, has also been indirectly detected with radial velocity (RV) measurements. The star is a known δ Scuti pulsator, and t…
Long-term Monitoring of Didymos with the LCOGT Network and MRO after the DART Impact
Lister, Tim; Chatelain, Joseph; Gomez, Edward +8 more
The world's first planetary defense test mission was carried out in late 2022 by NASA's Double Asteroid Redirection Test (DART) mission. The main DART spacecraft, which was accompanied by the ASI-provided LICIACube cubesat, intentionally impacted Dimorphos, the smaller secondary of the near-Earth object binary system (65803) Didymos, on 2022 Septe…
A Volume-limited Radio Search for Magnetic Activity in 140 Exoplanets with the Very Large Array
Berger, Edo; Ortiz Ceballos, Kevin N.; Cendes, Yvette +1 more
We present results from a search for radio emission in 77 stellar systems hosting 140 exoplanets, predominantly within 17.5 pc using the Very Large Array (VLA) at 4–8 GHz. This is the largest and most sensitive search to date for radio emission in exoplanetary systems in the GHz frequency range. We obtained new observations of 58 systems and analy…
Mysteries of the 17 May 2012 Solar Event Responsible for GLE71. I. CME Development and the Role of Disturbances Excited by Eruptions
Firoz, K. A.; Grechnev, V. V.; Lysenko, A. L. +3 more
The SOL2012-05-17 event is remarkable in that it caused one of two ground-level enhancements (GLE71) in Solar Cycle 24. Despite the efforts spent studying this solar event, some aspects of it remain unclear. This relates to the development of a coronal mass ejection (CME), the history of the shock wave, and the flare. Our measurements reveal the f…
Cluster population demographics in NGC 628 derived from stochastic population synthesis models
Grasha, Kathryn; Krumholz, Mark R.; Tang, Jianling
The physical properties of star cluster populations offer valuable insights into their birth, evolution, and disruption. However, individual stars in clusters beyond the nearest neighbours of the Milky Way are unresolved, forcing analyses of star cluster demographics to rely on integrated light, a process fraught with uncertainty. Here, we infer t…
Global Impact of Emerging Internetwork Fields on the Low Solar Atmosphere
Gošić, M.; De Pontieu, B.; Sainz Dalda, A.
Small-scale, newly emerging internetwork (IN) magnetic fields are considered a viable source of energy and mass for the solar chromosphere and possibly the corona. Multiple studies show that single events of flux emergence can indeed locally heat the low solar atmosphere through interactions of the upward propagating magnetic loops and the preexis…
The Galactic Bulge Exploration. III. Calcium Triplet Metallicities for RR Lyrae Stars
Kunder, Andrea; Reggiani, Henrique; Covey, Kevin R. +5 more
RR Lyrae stars (RRLs) are excellent tracers of stellar populations for old, metal-poor components in the the Milky Way and the Local Group. Their luminosities have a metallicity dependence, but determining spectroscopic [Fe/H] metallicities for RRLs, especially at distances outside the solar neighborhood, is challenging. Using 40 RRLs with metalli…
The origin of the X-ray emission from the non-starburst gas-rich luminous infrared galaxies Arp 302
Jiang, Jiachen; Gallo, Luigi; Baker, William +1 more
We present an analysis of the XMM-Newton observation of luminous infrared merging galaxies Arp 302 and a joint re-analysis of its Chandra observation. In particular, we focus on the more significant X-ray emitter of the pair, Arp 302N. Chandra detects significant soft X-ray emission from the hot gas in the star-forming region of Arp 302N spreading…
The Radio Halo in PLCKESZ G171.94–40.65: Beacon of Merging Activity
Brunetti, G.; Wik, D. R.; Santra, R. +6 more
We present the first multifrequency analysis of the candidate ultrasteep spectrum radio halo in the galaxy cluster PLCKESZ G171.94‑40.65, using the upgraded Giant Metrewave Radio telescope (400 MHz), and Karl G. Jansky Very Large Array (1–2 GHz) observations. Our radio data have been complemented with archival Chandra X-ray observations to provide…