A5057446180- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Stellar, planetary, and galactic studies
- Geophysics and Sensor Technology
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
Norwegian University of Science and Technology
2023-2025
University of Copenhagen
2020
Abstract We present the discovery of variable optical counterpart to PSR J2055+1545, a redback millisecond pulsar, and first radial velocity curve its companion star. The multi-band light curves this system show 0.4–0.6 mag amplitude modulation with single peak per orbit colours, suggesting that is mildly irradiated by pulsar wind. find flux maximum asymmetric occurs at orbital phase ≃ 0.4, anticipating superior conjunction (where emission companions typically brightest). ascribe asymmetry,...
Abstract Redshifts used in current cosmological supernova samples are measured using two primary techniques, one based on well-measured host galaxy spectral lines and the other supernova-dominated spectra. Here, we construct an updated Pantheon catalog with revised redshifts, redshift sources, estimated uncertainties for entire sample to investigate whether these techniques yield consistent results. The best-fit parameters measurement disagree, a supernova-only producing Ω m 3.2 σ higher H 0...
ABSTRACT We present the first multiband optical light curves of PSR J1622−0315, among most compact known redback binary millisecond pulsars, with an orbital period $P_\mathrm{orb}=3.9 \, \text{h}$. find a flux modulation two maxima per cycle and peak-to-peak amplitude ${\simeq} 0.3 \text{mag}$, which we attribute to ellipsoidal shape tidally distorted companion star. The colours imply late-F early-G spectral-type do not show any detectable temperature changes along orbit. This suggests that...
ABSTRACT We present GTC-OSIRIS phase-resolved optical spectroscopy of three compact binary millisecond pulsars, or ‘spiders’: PSR J1048+2339, J1810+1744, and (for the first time) J1908+2105. For companion in each system, temperature is traced throughout its orbit, radial velocities are measured. The found to vary with absorption features used when measuring them, resulting different velocity curve semi-amplitudes: for J1048 ($K_\mathrm{metals, red} = 344 \pm 4{\mathrm{\, km\, s^{-1}}}{}$...
We present GTC-OSIRIS phase-resolved optical spectroscopy of three compact binary MSPs, or `spiders': PSR J1048+2339, J1810+1744, and (for the first time) J1908+2105. For companion in each system, temperature is traced throughout its orbit, radial velocities are measured. The found to vary with absorption features used when measuring them, resulting a lower velocity curve semi-amplitude measured from day side two systems compared night: for J1048 ($K_\mathrm{day} = 344 \pm 4$ km s$^{-1}$,...
The companion to PSR J1622-0315, one of the most compact known redback millisecond pulsars, shows extremely low irradiation despite its short orbital period. We model this system determine binary parameters, combining optical observations from NTT in 2017 and NOT 2022 with modeling code ICARUS. find a best-fit neutron star mass $2.3 \pm 0.4\,\text{M}_\odot $, $0.15 0.02\,\text{M}_\odot$. detect for first time low-level asymmetry minima as well change maxima light curves over five years....
Abstract The companion to PSR J1622-0315, one of the most compact known redback millisecond pulsars, shows extremely low irradiation despite its short orbital period. We model this system determine binary parameters, combining optical observations from New Technology Telescope in 2017 and Nordic Optical 2022 with modeling code ICARUS . find a best-fit neutron star mass 2.3 ± 0.4 M ⊙ , 0.15 0.02 detect for first time low-level asymmetry minima as well change maxima light curves over five...
We present the first multi-band optical light curves of PSR J1622-0315, among most compact known redback binary millisecond pulsars, with an orbital period Porb=3.9 h. find a flux modulation two maxima per cycle and peak-to-peak amplitude about 0.3 mag, which we attribute to ellipsoidal shape tidally distorted companion star. The colours imply late-F early-G spectral type do not show any detectable temperature changes along orbit. This suggests that irradiation star's inner face by pulsar...