Search Results - "Guenther, E W"

Properties of flares and CMEs on EV Lac: possible erupting filament by Muheki, Priscilla, Guenther, E W, Mutabazi, T, Jurua, E

“…ABSTRACT Flares and coronal mass ejections (CMEs) are very powerful events in which energetic radiation and particles are ejected within a short time. These…”
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Stellar coronal mass ejections – II. Constraints from spectroscopic observations by Odert, P, Leitzinger, M, Guenther, E W, Heinzel, P

“…ABSTRACT Detections of stellar coronal mass ejections (CMEs) are still rare. Observations of strong Balmer line asymmetries during flare events have been…”
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A census of coronal mass ejections on solar-like stars by Leitzinger, M, Odert, P, Greimel, R, Vida, K, Kriskovics, L, Guenther, E W, Korhonen, H, Koller, F, Hanslmeier, A, Kővári, Zs, Lammer, H

“…ABSTRACT Coronal mass ejections (CMEs) may have major importance for planetary and stellar evolution. Stellar CME parameters, such as mass and velocity, have…”
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A search for flares and mass ejections on young late-type stars in the open cluster Blanco-1 by Leitzinger, M., Odert, P., Greimel, R., Korhonen, H., Guenther, E. W., Hanslmeier, A., Lammer, H., Khodachenko, M. L.

“…We present a search for stellar activity (flares and mass ejections) in a sample of 28 stars in the young open cluster Blanco-1. We use optical spectra…”
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The flare-activity of 2MASS J16111534–1757214 in the upper Scorpius association by Guenther, E W, Wöckel, D, Chaturvedi, P, Kumar, V, Srivastava, M K, Muheki, P

“…ABSTRACT Flares are known to play an important role for the evolution of the atmospheres of young planets. In order to understand the evolution of planets, it…”
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Pre-main-sequence stars in the star-forming complex Sh 2-284 by Cusano, F., Ripepi, V., Alcalá, J. M., Gandolfi, D., Marconi, M., Degl'Innocenti, S., Palla, F., Guenther, E. W., Bernabei, S., Covino, E., Neiner, C., Puga, E., Hony, S.

“…Located at the Galactic anticentre, Sh 2-284 is an H ii region that harbours several young open clusters. Dolidze 25, a rare metal-poor (Z∼ 0.004) young…”
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Sub-stellar companions of intermediate-mass stars with CoRoT: CoRoT–34b, CoRoT–35b, and CoRoT–36b by Sebastian, D, Guenther, E W, Deleuil, M, Dorsch, M, Heber, U, Heuser, C, Gandolfi, D, Grziwa, S, Deeg, H J, Alonso, R, Bouchy, F, Csizmadia, Sz, Cusano, F, Fridlund, M, Geier, S, Irrgang, A, Korth, J, Nespral, D, Rauer, H, Tal-Or, L

“…ABSTRACT Theories of planet formation give contradicting results of how frequent close-in giant planets of intermediate mass stars (IMSs; $1.3\le M_{\star }\le…”
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A new mass and radius determination of the ultra-short period planet K2-106b and the fluffy planet K2-106c by Guenther, E W, Goffo, E, Sebastian, D, Smith, A M S, Persson, C M, Fridlund, M, Gandolfi, D, Korth, J

“…ABSTRACT Ultra-short period planets (USPs) have orbital periods of less than 1 d. Since their masses and radii can be determined to a higher precision than…”
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Everything that glitters is not gold: V1315 Cas is not a dormant black hole by Zak, J, Jones, D, Boffin, H M J, Beck, P G, Klencki, J, Bodensteiner, J, Shenar, T, Van Winckel, H, Skarka, M, Arellano-Córdova, K, Viuho, J, Sowicka, P, Guenther, E W, Hatzes, A

“…ABSTRACT The quest for quiet or dormant black holes has been ongoing since several decades. Ellipsoidal variables possibly indicate the existence of a very…”
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The TWA 3 Young Triple System: Orbits, Disks, Evolution by Kellogg, Kendra, Prato, L., Torres, Guillermo, Schaefer, G. H., Avilez, I., Ruíz-Rodríguez, D., Wasserman, L. H., Bonanos, Alceste Z., Guenther, E. W., Neuhäuser, R., Levine, S. E., Bosh, A. S., Morzinski, Katie M., Close, Laird, Bailey, Vanessa, Hinz, Phil, Males, Jared R.

“…We have characterized the spectroscopic orbit of the TWA 3A binary and provide preliminary families of probable solutions for the TWA 3A visual orbit, as well…”
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Spectral synthesis analysis and radial velocity study of the northern F-, G- and K-type flare stars by König, B., Guenther, E. W., Esposito, M., Hatzes, A.

“…In this paper, we present a study of the general physical and chemical properties and radial velocity monitoring of young active stars. We derive temperatures,…”
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MO Lup: a hierarchical triple T Tauri system by Esposito, M., Covino, E., Alcalá, J. M., Guenther, E. W., Schisano, E.

“…In this paper, we present a thorough study of the T Tauri system MO Lup. We report on its previously unrecognized triple spectroscopic nature. Our study is…”
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K2-140b and K2-180b – Characterization of a hot Jupiter and a mini-Neptune from the K2 mission by Korth, J, Csizmadia, Sz, Gandolfi, D, Fridlund, M, Pätzold, M, Hirano, T, Livingston, J, Persson, C M, Deeg, H J, Justesen, A B, Barragán, O, Grziwa, S, Endl, M, Tronsgaard, R, Dai, F, Cochran, W D, Albrecht, S, Alonso, R, Cabrera, J, Cauley, P W, Cusano, F, Eigmüller, Ph, Erikson, A, Esposito, M, Guenther, E W, Hatzes, A P, Hidalgo, D, Kuzuhara, M, Montañes, P, Napolitano, N R, Narita, N, Niraula, P, Nespral, D, Nowak, G, Palle, E, Petrillo, C E, Redfield, S, Prieto-Arranz, J, Rauer, H, Smith, A M S, Tortora, C, Van Eylen, V, Winn, J N

“…We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V = 12.6 mag,…”
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On the optimum operating conditions of ThNe calibration lamps for measurements of radial velocity variations by Eiff, M. Ammler‐von, Guenther, E. W.

“…Previous studies have shown that ThNe lamps are very suitable for the precise measurement of wavelength variations. A critical issue for all hollow cathode…”
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The power of low-resolution spectroscopy: On the spectral classification of planet candidates in the ground-based CoRoT follow-up by Ammler-von Eiff, M., Sebastian, D., Guenther, E. W., Stecklum, B., Cabrera, J.

“…Planetary transits detected by the CoRoT mission can be mimicked by a low‐mass star in orbit around a giant star. Spectral classification helps to identify the…”
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Flare stars in the TW Hydrae association: the HIP 57269 system by König, B., Neuhäuser, R., Guenther, E. W., Hambaryan, V.

“…We discuss a new member candidate of the TW Hydrae association (TWA) among the stars of the Gershberg et al. (1999) flare star catalog. TWA is one of the…”
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A planet in a polar orbit of 1.4 solar-mass star by Guenther, E.W., Cusano, F., Deeg, H., Gandolfi, D., Geier, S., Grziwa, S., Heber, U., Tal-Or, L., Sebastian, D., Rodler, F.

“…Although more than a thousand transiting extrasolar planets have been discovered, only very few of them orbit stars that are more massive than the Sun. The…”
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Hot subdwarfs in binary systems and the nature of their unseen companions by Geier, S., Heber, U., Tillich, A., Hirsch, H., Edelmann, H., Schaffenroth, V., Kupfer, T., Müller, S., Maxted, P. F. L., Østensen, R., Podsiadlowski, P., Marsh, T., Gänsicke, B., Morales-Rueda, L., Nelemans, G., Napiwotzki, R., Günther, E. W., Carone, L.

“…A large fraction of the sdB stars reside in short period binaries. It is therefore clear that binary evolution plays an important role in the still unsolved…”
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The Flare-Activity of 2MASSJ16111534-1757214 in the Upper Scorpius association by Guenther, E. W, Woeckel, D, Chaturvedi, P, Kumar, V, Srivastava, M. K, Muheki, P

“…Flares are known to play an important role for the evolution of the atmospheres of young planets. In order to understand the evolution of planets, it is thus…”
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Stellar coronal mass ejections II. Constraints from spectroscopic observations by Odert, P, Leitzinger, M, Guenther, E. W, Heinzel, P

“…MNRAS (2020) 494: 3766-3783 Detections of stellar coronal mass ejections (CMEs) are still rare. Observations of strong Balmer line asymmetries during flare…”
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