Franz-Josef Hambsch
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View article: TESS and ground-based observations of WZ Sge-type dwarf novae in outburst
TESS and ground-based observations of WZ Sge-type dwarf novae in outburst Open
Dwarf nova (DN) superoutbursts are accompanied by superhumps, which change their periods and profiles over a superoutburst. We present the TESS and ground-based observations of nine WZ Sge-type DNe and candidates in superoutburst. In TCP J…
View article: Revisiting the extremely long-period cataclysmic variables V479 Andromedae and V1082 Sagittarii
Revisiting the extremely long-period cataclysmic variables V479 Andromedae and V1082 Sagittarii Open
Context. The overwhelming majority of cataclysmic variables (CVs) have orbital periods shorter than 10 h. However, a few have much longer orbital periods, and their formation and existence pose certain challenges for the CV evolution model…
View article: Revisiting the extremely long-period cataclysmic variables V479 Andromedae and V1082 Sagitarii
Revisiting the extremely long-period cataclysmic variables V479 Andromedae and V1082 Sagitarii Open
The overwhelming majority of CVs have orbital periods shorter than 10 hr. However, a few have much longer periods, and their formation and existence pose challenges for the CV evolution models. These extremely long-period CVs must host nuc…
View article: Rapid Change in the Orbital Period of the Remnant of Nova Scorpii AD 1437 (IGR J17014-4306)
Rapid Change in the Orbital Period of the Remnant of Nova Scorpii AD 1437 (IGR J17014-4306) Open
IGR J17014-4306 is the longest orbital period (12.8 hr) deep-eclipsing intermediate polar known, where a massive white dwarf (WD) accretes matter from its companion star via an accretion disk. Based on photometric observations from the Tra…
View article: GOTO065054+593624: An 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers
GOTO065054+593624: An 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers Open
Dwarf novae are astrophysical laboratories for probing the nature of accretion, binary mass transfer, and binary evolution, but their diverse observational characteristics continue to challenge our theoretical understanding. We here presen…
View article: TCP J07222683$+$6220548: a new AM CVn type system with infrequent outbursts
TCP J07222683$+$6220548: a new AM CVn type system with infrequent outbursts Open
We present the discovery of TCP J07222683$+$6220548, a new ultracompact binary system of the AM CVn type. This system was first identified displaying a $ΔV = 7.6$ mag outburst on 2025-01-20.9416 UTC by the New Milky Way wide-field survey f…
View article: Is the symbiotic recurrent nova T CrB late? Recent photometric evolution and comparison with past pre-outburst behaviour
Is the symbiotic recurrent nova T CrB late? Recent photometric evolution and comparison with past pre-outburst behaviour Open
T CrB is a symbiotic recurrent nova that last erupted in 1946. Given its recurrence time-scale of approximately 80 yr, the next outburst is eagerly anticipated by the astronomical community. In this work, we analyse the optical light curve…
View article: A targeted search for binary white dwarf pulsars using <i>Gaia</i> and WISE
A targeted search for binary white dwarf pulsars using <i>Gaia</i> and WISE Open
After its discovery in 2016, the white dwarf binary AR Scorpii (AR Sco) remained for several years the only white dwarf system to show pulsed radio emission associated with a fast-spinning white dwarf. The evolutionary origin and the emiss…
View article: A Long-duration Superflare on the K Giant HD 251108
A Long-duration Superflare on the K Giant HD 251108 Open
Many giant stars are magnetically active, which causes rotational variability, chromospheric emission lines, and X-ray emission. Large outbursts in these emission features can set limits on the magnetic field strength and thus constrain th…
View article: A long-duration superflare on the K giant HD 251108
A long-duration superflare on the K giant HD 251108 Open
Many giant stars are magnetically active, which causes rotational variability, chromospheric emission lines, and X-ray emission. Large outbursts in these emission features can set limits on the magnetic field strength and thus constrain th…
View article: Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-velocity Characterization
Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-velocity Characterization Open
We report discovering an exoplanet from following up a microlensing event alerted by Gaia. The event Gaia22dkv is toward a disk source rather than the traditional bulge microlensing fields. Our primary analysis yields a Jovian planet with …
View article: Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi
Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi Open
EX Lupi, a low-mass young stellar object, went into an accretion-driven outburst in 2022 March. The outburst caused a sudden phase change of ∼112° ± 5° in periodically oscillating multiband lightcurves. Our high-resolution spectra obtained…
View article: Erratum: Optical and soft X-ray light-curve analysis during the 2022 eruption of U Scorpii: Structural changes in the accretion disk
Erratum: Optical and soft X-ray light-curve analysis during the 2022 eruption of U Scorpii: Structural changes in the accretion disk Open
In the original version of article [Publ. Astron. Soc. Japan (2024) 76(2); https://doi.org/10.1093/pasj/psae010], the email address was incorrectly typed during the production process. The PDF and HTML versions of the original article are …
View article: Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova
Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova Open
We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar “03fg-like” (or “super-Chandrasekhar”) Type Ia supernova (SN Ia), in the nebular phase at 338 days postexplosion. Our combined spectrum continuously cov…
View article: Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi
Accretion Funnel Reconfiguration during an Outburst in a Young Stellar Object: EX Lupi Open
EX Lupi, a low-mass young stellar object, went into an accretion-driven outburst in March of 2022. The outburst caused a sudden phase change of ~ 112$^{\circ}$ $\pm$ 5$^{\circ}$ in periodically oscillating multiband lightcurves. Our high r…
View article: Optical and soft X-ray light-curve analysis during the 2022 eruption of U Scorpii: Structural changes in the accretion disk
Optical and soft X-ray light-curve analysis during the 2022 eruption of U Scorpii: Structural changes in the accretion disk Open
We present our optical photometric observations of the 2022 eruption of the recurrent nova U Scorpii (U Sco) using 49152 data points over 70 d following the optical peak. We have also analyzed its soft X-ray (0.3–1 keV) light curve by the …
View article: Optical and soft X-ray light-curve analysis during the 2022 eruption of U Scorpii: structural changes in the accretion disk
Optical and soft X-ray light-curve analysis during the 2022 eruption of U Scorpii: structural changes in the accretion disk Open
We present our optical photometric observations of the 2022 eruption of the recurrent nova U Scorpii (U Sco) using 49,152 data points over 70 d following the optical peak. We have also analyzed its soft X-ray (0.3--1 keV) light curve by th…
View article: A survey for variable young stars with small telescopes – VIII. Properties of 1687 <i>Gaia</i> selected members in 21 nearby clusters
A survey for variable young stars with small telescopes – VIII. Properties of 1687 <i>Gaia</i> selected members in 21 nearby clusters Open
The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multifilter, high cadence monitoring of 25 nearby young clusters and star-forming regions. Utilizing Gaia DR3 data, we have identified about 17 000 potential y…
View article: A survey for variable young stars with small telescopes: VIII -- Properties of 1687 Gaia selected members in 21 nearby clusters
A survey for variable young stars with small telescopes: VIII -- Properties of 1687 Gaia selected members in 21 nearby clusters Open
The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multi-filter, high cadence monitoring of 25 nearby young clusters and star forming regions. Utilising Gaia DR3 data we have identified about 17000 potential yo…
View article: Ground-based and JWST Observations of SN 2022pul. I. Unusual Signatures of Carbon, Oxygen, and Circumstellar Interaction in a Peculiar Type Ia Supernova
Ground-based and JWST Observations of SN 2022pul. I. Unusual Signatures of Carbon, Oxygen, and Circumstellar Interaction in a Peculiar Type Ia Supernova Open
Nebular-phase observations of peculiar Type Ia supernovae (SNe Ia) provide important constraints on progenitor scenarios and explosion dynamics for both these rare SNe and the more common, cosmologically useful SNe Ia. We present observati…
View article: Author Correction: A planetary collision afterglow and transit of the resultant debris cloud
Author Correction: A planetary collision afterglow and transit of the resultant debris cloud Open
View article: The Accretion History of EX Lup: A Century of Bursts, Outbursts, and Quiescence
The Accretion History of EX Lup: A Century of Bursts, Outbursts, and Quiescence Open
EX Lup is the archetype for the class of young stars that undergoes repeated accretion outbursts of ∼5 mag at optical wavelengths that last for months. Despite extensive monitoring that dates back 130 yr, the accretion history of EX Lup re…
View article: A planetary collision afterglow and transit of the resultant debris cloud
A planetary collision afterglow and transit of the resultant debris cloud Open
Planets grow in rotating disks of dust and gas around forming stars, some of which can subsequently collide in giant impacts after the gas component is removed from the disk. Monitoring programs with the warm Spitzer mission have recorded …
View article: A planetary collision afterglow and transit of the resultant debris cloud
A planetary collision afterglow and transit of the resultant debris cloud Open
View article: ASASSN-21qj astronomical observations
ASASSN-21qj astronomical observations Open
Data from astronomical observatories looking at the star ASASSN-21qj.
View article: ASASSN-21qj astronomical observations
ASASSN-21qj astronomical observations Open
Data from astronomical observatories looking at the star ASASSN-21qj.
View article: Ground-based and JWST Observations of SN 2022pul: II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type-Ia Supernova
Ground-based and JWST Observations of SN 2022pul: II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type-Ia Supernova Open
We present an analysis of ground-based and JWST observations of SN~2022pul, a peculiar "03fg-like" (or "super-Chandrasekhar") Type Ia supernova (SN Ia), in the nebular phase at 338d post explosion. Our combined spectrum continuously covers…
View article: The Accretion History of EX Lup: A Century of Bursts, Outbursts, and Quiescence
The Accretion History of EX Lup: A Century of Bursts, Outbursts, and Quiescence Open
EX Lup is the archetype for the class of young stars that undergoes repeated accretion outbursts of $\sim 5$ mag at optical wavelengths and that last for months. Despite extensive monitoring that dates back 130 years, the accretion history…
View article: Modeling the Multiwavelength Evolution of the V960 Mon System
Modeling the Multiwavelength Evolution of the V960 Mon System Open
We study the evolution of the FU Ori object V960 Mon since its outburst, using available multiwavelength photometric time series over 8 yr, complemented by several epochs of moderate-dispersion spectrophotometry. We find that the source fa…
View article: PM 1-322: New variable planetary nebula
PM 1-322: New variable planetary nebula Open
Context. Spectra of planetary nebulae (PNe) are characterised by strong forbidden emission lines and often also by an infrared (IR) excess. A few PNe show dust obscuration events and/or harbour long-period binaries. Some post-asymptotic gi…