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A seven-Earth-radius helium-burning star inside a 20.5-min detached binary
Filippenko, Alexei V.; Han, Zhanwen; Chen, Xuefei +28 more
Binary evolution theory predicts that the second common envelope ejection can produce low-mass (0.32-0.36 M⊙) subdwarf B (sdB) stars inside ultrashort-orbital-period binary systems, as their helium cores are ignited under nondegenerate conditions. With the orbital decay driven by gravitational-wave (GW) radiation, the minimum orbital pe…
PROJECT-J: JWST Observations of HH46 IRS and Its Outflow. Overview and First Results
Hartigan, Patrick; Codella, Claudio; Alcalá, Juan M. +23 more
We present the first results of the JWST program PROJECT-J (PROtostellar JEts Cradle Tested with JWST), designed to study the Class I source HH46 IRS and its outflow through NIRSpec and MIRI spectroscopy (1.66–28 µm). The data provide line images (∼6.″6 in length with NIRSpec, and up to ∼20″ with MIRI) revealing unprecedented details within …
Dissecting the Crab Nebula with JWST: Pulsar Wind, Dusty Filaments, and Ni/Fe Abundance Constraints on the Explosion Mechanism
Temim, Tea; Drissen, Laurent; Rest, Armin +19 more
We present JWST observations of the Crab Nebula, the iconic remnant of the historical SN 1054. The observations include NIRCam and MIRI imaging mosaics plus MIRI/MRS spectra that probe two select locations within the ejecta filaments. We derive a high-resolution map of dust emission and show that the grains are concentrated in the innermost, high-…
Introducing the Condor Array Telescope - IV. A possible nova super-remnant surrounding the putative recurrent nova KT Eridani
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +10 more
Just 10 recurrent novae (RNe) - which erupt repeatedly on time-scales shorter than one century - are known in our Galaxy. The most extreme RN known (located in the Andromeda galaxy), M31N 2008-12a, undergoes a nova eruption every year, and is surrounded by a vast nova 'super-remnant', 134 pc in extent. Simulations predict that all RNe should be su…
What Are the Pillars of Reionization? Revising the AGN Luminosity Function at z ∼ 5
Bisigello, Laura; Grazian, Andrea; Boutsia, Konstantina +22 more
In the past, high-z active galactic nuclei (AGNs) were given a minor role as possible drivers of reionization, despite initial evidence in favor of their large space densities at low luminosities by Chandra and the Hubble Space Telescope. Recent observations from JWST are finding relatively large numbers of faint AGNs at z > 4, convincingly con…
Survival of the long-lived inner disk of PDS70
Bae, Jaehan; Benisty, Myriam; Facchini, Stefano +2 more
The K7 T Tauri star PDS 70 remains the best laboratory for investigating the influence of giant planet formation on the structure of the parental disk. One of the most intriguing discoveries is the detection of a resolved inner disk from ALMA observations that extends up to the orbit of PDS 70b. It is challenging to explain this inner disk because…
Dynamical accretion flows: ALMAGAL: Flows along filamentary structures in high-mass star-forming clusters
Avison, A.; Rygl, K. L. J.; Testi, L. +47 more
Context. Investigating the flow of material along filamentary structures towards the central core can help provide insights into high-mass star formation and evolution. Aims. Our main motivation is to answer the question of what the properties of accretion flows are in star-forming clusters. We used data from the ALMA Evolutionary Study of High Ma…
X-Shooting ULLYSES: Massive stars at low metallicity: V. Effect of metallicity on surface abundances of O stars
Bouret, J. -C.; Martins, F.; Hillier, D. J. +10 more
Context. Massive stars rotate faster, on average, than lower mass stars. Stellar rotation triggers hydrodynamical instabilities which transport angular momentum and chemical species from the core to the surface. Models of high-mass stars that include these processes predict that chemical mixing is stronger at lower metallicity. Aims. We aim to tes…
JWST MIRI/Medium Resolution Spectrograph (MRS) Observations and Spectral Models of the Underluminous Type Ia Supernova 2022xkq
Suntzeff, N. B.; Wang, L.; Galbany, L. +44 more
We present a JWST mid-infrared (MIR) spectrum of the underluminous Type Ia Supernova (SN Ia) 2022xkq, obtained with the medium-resolution spectrometer on the Mid-Infrared Instrument (MIRI) ∼130 days post-explosion. We identify the first MIR lines beyond 14 µm in SN Ia observations. We find features unique to underluminous SNe Ia, including t…
A JWST/MIRI analysis of the ice distribution and polycyclic aromatic hydrocarbon emission in the protoplanetary disk HH 48 NE
van Dishoeck, E. F.; Rocha, W. R. M.; Lis, D. C. +18 more
Context. Ice-coated dust grains provide the main reservoir of volatiles that play an important role in planet formation processes and may become incorporated into planetary atmospheres. However, due to observational challenges, the ice abundance distribution in protoplanetary disks is not well constrained. With the advent of the James Webb Space T…