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Hidden Gems on a Ring: Infant Massive Clusters and Their Formation Timeline Unveiled by ALMA, HST, and JWST in NGC 3351
Wilson, Christine D.; Bolatto, Alberto D.; Henshaw, Jonathan D. +38 more
We use 0.1″ observations from the Atacama Large Millimeter Array (ALMA), Hubble Space Telescope (HST), and JWST to study young massive clusters (YMCs) in their embedded "infant" phase across the central starburst ring in NGC 3351. Our new ALMA data reveal 18 bright and compact (sub-)millimeter continuum sources, of which 8 have counterparts in JWS…
Did the Gaia Enceladus/Sausage merger form the Milky Way's bar?
Grand, Robert J. J.; Fragkoudi, Francesca; Merrow, Alex +1 more
The Milky Way's last significant merger, the Gaia Enceladus/Sausage (GES), is thought to have taken place between $8\hbox{ and }11\, \mathrm{Gyr}$ ago. Recent studies in the literature suggest that the bar of the Milky Way is rather old, indicating that it formed at a similar epoch to the GES merger. We investigate the possible link between these …
The photospheres of the hottest fastest stars in the Galaxy
El-Badry, Kareem; Rauch, Thomas; Werner, Klaus +2 more
We perform nonlocal thermodynamic equilibrium (NLTE) model atmosphere analyses of the three hottest hypervelocity stars (space velocities between ≈1500-2800 km s−1) known to date, which were recently discovered spectroscopically and identified as runaways from Type Ia supernovae. The hottest of the three (J0546+0836, effective temperatu…
Measuring the Milky Way Vertical Potential with the Phase Snail in a Model-independent Way
Mao, Shude; Liu, Chao; Shen, Juntai +2 more
The vertical phase-space spiral (snail) is a direct sign of disequilibrium of the Milky Way's disk. Nevertheless, the wrapping of the phase snail contains information on the vertical potential. We propose a novel method to measure the vertical potential utilizing the intersections between the snail and z/V z axes, for which we know th…
A 1.55 R⊕ habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole
Triaud, Amaury H. M. J.; Latham, David W.; Stassun, Keivan G. +48 more
A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is therefore the time to identify the most unique planets to be characterized with these instruments. In this context, we report on …
JWST Observations of Young protoStars (JOYS): HH211: Textbook case of a protostellar jet and outflow
Östlin, G.; Güdel, M.; Ray, T. P. +22 more
Context. Due to the high visual extinction and lack of sensitive mid-infrared (MIR) telescopes, the origin and properties of outflows and jets from embedded Class 0 protostars are still poorly constrained. Aims. We aim to characterise the physical, kinematic, and dynamical properties of the HH 211 jet and outflow, one of the youngest protostellar …
Evolution of Flare Activity in GKM Stars Younger Than 300 Myr over Five Years of TESS Observations
France, Kevin; Gagné, Jonathan; Feinstein, Adina D. +2 more
Stellar flares are short-duration (< hours) bursts of radiation associated with surface magnetic reconnection events. Stellar magnetic activity generally decreases as a function of both the age and Rossby number, R 0, a measure of the relative importance of the convective and rotational dynamos. Young stars (<300 Myr) have typical…
Signatures of Tidal Disruption of the Hercules Ultrafaint Dwarf Galaxy
Erkal, Denis; Geha, Marla; Frebel, Anna +6 more
The Hercules ultrafaint dwarf galaxy (UFD) has long been hypothesized to be tidally disrupting, yet no conclusive evidence has been found for tidal disruption owing partly to difficulties in identifying Hercules member stars. In this work, we present a homogeneous reanalysis of new and existing observations of Hercules, including the detection of …
Multiwavelength detection of an ongoing FUOr-type outburst on a low-mass YSO
Minniti, D.; Bayo, A.; Alonso-García, J. +13 more
During the pre-main-sequence evolution, Young Stellar Objects (YSOs) assemble most of their mass during the episodic accretion process. The rarely seen FUOr-type events are valuable laboratories to investigate the outbursting nature of YSOs. Here, we present multiwavelength detection of a high-amplitude eruptive source in the young open cluster Vd…
Growing local arm inferred by the breathing motion
Kawata, Daisuke; Fujii, Michiko S.; Baba, Junichi +1 more
Theoretical models of spiral arms suggest that the spiral arms provoke a vertical bulk motion in disc stars. By analysing the breathing motion, a coherent asymmetric vertical motion around the mid-plane of the Milky Way disc, with Gaia DR3, we found that a compressing breathing motion presents along the Local arm. On the other hand, with an N-body…