Astrophysical: Observational astronomy

  • Publication
    Accurately constraining velocity information from spectral imaging observations using machine learning techniques

    Determining accurate plasma Doppler (line-of-sight) velocities from spectroscopic measurements is a challenging endeavour, especially when weak chromospheric...

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    BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS)

    Elements with weak and blended spectral features in stellar spectra are challenging to measure and require specialized analysis methods to precisely measure...

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    Chromospheric Resonances above Sunspots and Potential Seismological Applications

    Oscillations in sunspot umbrae exhibit remarkable differences between the photosphere and chromosphere. We evaluate two competing scenarios proposed for...

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    Natural Night Sky Brightness during Solar Minimum

    In 2018, Solar Cycle 24 entered into a solar minimum phase. During this period, 11 million zenithal night sky brightness (NSB) data were collected at different...

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    The Changing Rotational Light-curve Amplitude of Varuna and Evidence for a Close-in Satellite

    From CCD observations carried out with different telescopes, we present short-term photometric measurements of the large trans-Neptunian object Varuna in 10...

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    The TESS-Keck Survey: Science Goals and Target Selection

    The Kepler and TESS missions have demonstrated that planets are ubiquitous. However, the success of these missions heavily depends on ground-based radial...

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    TOI-1696: A Nearby M4 Dwarf with a 3 R <SUB>⊕</SUB> Planet in the Neptunian Desert

    We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of 3.09 ± 0.11 R ⊕ and...

  • Publication
    Unraveling the Complex Behavior of Mrk 421 with Simultaneous X-Ray and VHE Observations during an Extreme Flaring Activity in 2013 April

    We report on a multiband variability and correlation study of the TeV blazar Mrk 421 during an exceptional flaring activity observed from 2013 April 11 to 19...