Experimental investigation of the trigger problem in magnetic reconnection by Katz, Noam Karasov

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Transmission Spectroscopy of the Habitable Zone Exoplanet LHS 1140 b with JWST/NIRISS by Cadieux, C, Doyon, R, MacDonald, RJ, Turbet, M, Artigau, É, Lim, O, Radica, M, Fauchez, TJ, Salhi, S, Dang, L, Albert, L, Coulombe, L, Cowan, NB, Lafrenière, D, L’Heureux, A, Piaulet-Ghorayeb, C, Benneke, B, Cloutier, R, Charnay, B, Cook, NJ, Fournier-Tondreau, M, Plotnykov, M, Valencia, D

“…The GCM calculations predict that water clouds form below the transit photosphere, limiting their impact on transmission data. …”

Stellar activity and rotation of the planet host Kepler-17 from long-term space-borne photometry by Lanza, A, Netto, Y, Bonomo, A, Parviainen, H, Valio, A, Aigrain, S

“…</strong> We find two main active longitudes on the photosphere of Kepler-17, one of which has a lifetime of at least ∼1400 days although with a varying level of activity. …”

The Effects of Thomson Scattering and Chemical Mixing on Early-time Light Curves of Double-peaked Type IIb Supernovae by Seong Hyun Park, Sung-Chul Yoon, Sergei Blinnikov

“…By comparing the results from two different numerical codes (i.e., STELLA and SNEC ), we find that the optical brightness of the first peak can be reduced by more than a factor of 3 as a result of the effect of Thomson scattering that causes the thermalization depth to be located below the Rosseland mean photosphere, compared to the corresponding case where this effect is ignored. …”
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Highly Energetic Electrons Accelerated in Strong Solar Flares as a Preferred Driver of Sunquakes by H. Wu, Y. Dai, M. D. Ding

“…For the remaining one event, the sunquake epicenter is cospatial with a magnetic imprint, i.e., a permanent change of magnetic field on the photosphere. Quantitative calculation shows that the flare-induced downward Lorentz force can do enough work to power the sunquake, acting as a viable sunquake driver for this specific event.…”
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X-Ray, UV and Optical Observations of Classical Cepheids: New Insights into Cepheid Evolution, and the Heating and Dynamics of Their Atmospheres by Scott G. Engle, Edward F. Guinan

“…Numerous emission lines, indicating 104 K up to ~3 × 105 K plasmas, have been observed, showing Cepheids to have complex, dynamic outer atmospheres that also vary with the photospheric pulsation period. The FUV line emissions peak in the phase range φ ≈ 0.8-1.0 and vary by factors as large as 10×. …”
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Sources of solar energy and interplanetary magnetic field by V. N. Krivodubskij

“…While the second part of the upward energy, which is due to convective motions, will manifest itself at the photospheric level in the form of granulation movements of various scales accessible for observation. …”
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A Multiwavelength Light-curve Model of the Classical Nova V339 Del: A Mechanism for the Coexistence of Dust Dip and Supersoft X-Rays by Izumi Hachisu, Mariko Kato, Katsura Matsumoto

“…In our model, a strong shock arises far outside the photosphere after optical maximum, because later ejected matter collides with earlier ejected gas. …”
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Constraining the Systematics of (Acoustic) Wave Heating Estimates in the Solar Chromosphere by Momchil E. Molnar, Kevin P. Reardon, Steven R. Cranmer, Adam F. Kowalski, Ivan Milić

“…We studied the propagation of waves above the acoustic cutoff in the upper photosphere into the chromosphere with ultraviolet and optical spectral observations interpreted through comparison with 3D radiative magnetohydrodynamic Bifrost models to constrain the heating contribution from acoustic waves in the solar atmosphere. …”
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Magnetic Flux in the Sun Emerges Unaffected by Supergranular-scale Surface Flows by Prasad Mani, Chris S. Hanson, Siddharth Dhanpal, Shravan Hanasoge, Srijan Bharati Das, Matthias Rempel

“…Magnetic flux emergence from the convection zone into the photosphere and beyond is a critical component of the behavior of large-scale solar magnetism. …”
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An Independent Determination of the Distance to Supernova SN 1987A by Means of the Light Echo AT 2019xis by Aleksandar Cikota, Jiachen Ding, Lifan Wang, Dietrich Baade, Stefan Cikota, Peter Höflich, Justyn Maund, Ping Yang

“…The distance to SN 1987A has been previously measured by the expanding photosphere method and by using the angular size of the circumstellar rings with absolute sizes derived from light curves of narrow UV emission lines, with reported distances ranging from 46.77 to 55 kpc. …”
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The evolution of a spot–spot-type solar active region which produced a major solar eruption by Lijuan Liu, Lijuan Liu, Lijuan Liu

“…The bipoles were arranged in parallel on the photosphere, shown as two clusters of sunspots with opposite-sign polarities, so that the AR exhibited an overall large bipole configuration. …”
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Numerical Simulation of Solar Magnetic Flux Emergence Using the AMR–CESE–MHD Code by Zhipeng Liu, Chaowei Jiang, Xueshang Feng, Pingbing Zuo, Yi Wang

“…Meanwhile, two gradually separated polarity concentration zones appear in the photospheric layer, transporting the magnetic field and energy into the atmosphere through their vortical and shearing motions. …”
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Confinedness of an X3.1-class Solar Flare Occurred in NOAA 12192: Analysis from Multi-instrument Observations by N. Vasantharaju, F. Zuccarello, F. Ferrente, S. L. Guglielmino

“…The decrease of net fluxes in the brightening regions near the footpoints of the multisigmoidal AR in the photosphere and chromosphere, indicative of flux cancellation favoring tether-cutting reconnection (TCR), is observed using the magnetic field observations of HMI/SDO and SOT/Hinode, respectively. …”
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OBSERVATIONS OF AN ENERGETICALLY ISOLATED QUIET SUN TRANSIENT: EVIDENCE OF QUASI-STEADY CORONAL HEATING by Orange, N. Brice, Chesny, David L., Oluseyi, Hakeem

“…We consider the QS transient's temporally stable (≈35 minutes) radiative nature to occur as a result of the large-scale magnetic field geometries of the QS and/or relatively quiet nature of the magnetic photosphere, which possibly act to inhibit energetic build-up processes that are required to initiate a catastrophic eruption phase. …”
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Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System by Lewis, Nikole K., Knutson, Heather A., Fuller, Jim, Antoci, Victoria, Fulton, Benjamin J., Laughlin, Gregory, Deming, Drake, Shporer, Avi, Batygin, Konstantin, Cowan, Nicolas B., Agol, Eric, Burrows, Adam S., Fortney, Jonathan J., Langton, Jonathan, Showman, Adam P., de Wit, Julien

“…The extensive coverage allows us to better differentiate instrumental systematics from the transient heating of HAT-P-2 b's 4.5 μm photosphere and yields the detection of stellar pulsations with an amplitude of approximately 40 ppm. …”
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Incremental melting in the ureilite parent body: Initial composition, melting temperatures, and melt compositions by Collinet, Max, Grove, Timothy L

“…Melting residues identical to pigeonite-olivine ureilites (representing 80% of ureilites) have been produced in batch melting experiments of chondritic materials not depleted in alkali elements relative to the Sun’s photosphere (e.g., CI, H, LL chondrites), but only in a relatively narrow range of temperature (1120 ºC–1180 ºC). …”
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The chameleon on the branches: spectral state transition and dips in NGC 247 ULX-1 by D’Aì, A, Pinto, C, Del Santo, M, Pintore, F, Soria, R, Robba, A, Ambrosi, E, Alston, W, Barret, D, Fabian, AC, Fürst, F, Kara, E, Kosec, P, Middleton, M, Roberts, T, Rodriguez-Castillo, G, Walton, DJ

“…All seven spectra are well described by two thermal components: a colder (kTbb ∼ 0.1–0.2 keV) blackbody, interpreted as emission from the photosphere of a radiatively driven wind, and a hotter (kTdisc ∼ 0.6 keV) multicolour disc blackbody, likely due to reprocessing of radiation emitted from the innermost regions. …”
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HST/WFC3 transmission spectroscopy of the cold rocky planet TRAPPIST-1h by Garcia, LJ, Moran, SE, Rackham, BV, Wakeford, HR, Gillon, M, de Wit, J, Lewis, NK

“…This work outlines the limitations of modeling active photospheric regions with theoretical stellar spectra, and those brought by our lack of knowledge of the photospheric structure of ultracool dwarf stars. …”
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On the Cooling Tails of Thermonuclear X-ray Bursts: The IGR J17480–2446 Link by Linares, Manuel Alegret, Chakrabarty, Deepto, Van Der Klis, M.

“…We analyzed all X-ray bursts detected with the Rossi X-ray Timing Explorer and find strong evidence that they all have a thermonuclear origin, despite the fact that many do not show the canonical spectral softening along the decay imprinted on type I X-ray bursts by the cooling of the neutron star photosphere. We show that the persistent-to-burst power ratio is fully consistent with the accretion-to-thermonuclear efficiency ratio along the whole outburst, as is typical for type I X-ray bursts. …”
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