Zobrazeno 1 - 10
of 682
pro vyhledávání: '"Saar S"'
Autor:
Wargelin, B. J., Saar, S. H., Irving, Z. A., Slavin, J. D., Ratzlaff, P., Nascimento Jr, J. -D. do
Proxima Cen (GJ 551; dM5.5e) is one of only about a dozen fully convective stars known to have a stellar cycle, and the only one to have long-term X-ray monitoring. A previous analysis found that X-ray and mid-UV observations, particularly two epochs
Externí odkaz:
http://arxiv.org/abs/2411.04252
Autor:
Rescigno, F., Mortier, A., Dumusque, X., Lakeland, B. S., Haywood, R., Piskunov, N., Nicholson, B. A., López-Morales, M., Dalal, S., Cretignier, M., Klein, B., Cameron, A. Collier, Ghedina, A., Gonzalez, M., Cosentino, R., Sozzetti, A., Saar, S. H.
This work focuses on the analysis of the mean longitudinal magnetic field as a stellar activity tracer in the context of small exoplanet detection and characterisation in radial-velocity (RV) surveys. We use SDO/HMI filtergrams to derive Sun-as-a-sta
Externí odkaz:
http://arxiv.org/abs/2406.20023
Autor:
Velloso, E. N., Anthony, F., Nascimento Jr, J. D. do, Silveira, L. F. Q., Hall, J., Saar, S. H.
Publikováno v:
The Astrophysical Journal Letters, Volume 945, Issue 1, id.L12, 2023
The temporal analysis of stellar activity evolution is usually dominated by a complex trade-off between model complexity and interpretability, often by neglecting the non-stationary nature of the process. Recent studies appear to indicate that the pr
Externí odkaz:
http://arxiv.org/abs/2310.16974
Autor:
Matković, F., Brajša, R., Temmer, M., Heinemann, S. G., Ludwig, H. -G., Saar, S. H., Selhorst, C. L., Skokić, I., Sudar, D.
Publikováno v:
A&A 670, A146 (2023)
This study investigates and compares brightness and area of coronal bright points (CBPs) inside and outside of coronal holes (CHs) using the single-dish Band 6 observations by the Atacama Large Millimeter/submillimeter Array (ALMA), combined with ext
Externí odkaz:
http://arxiv.org/abs/2212.09443
Autor:
Milbourne, T. W., Phillips, D. F., Langellier, N., Mortier, A., Haywood, R. D., Saar, S. H., Cegla, H. M., Cameron, A. Collier, Dumusque, X., Latham, D. W., Malavolta, L., Maldonado, J., Thompson, S., Vanderburg, A., Watson, C. A., Buchhave, L. A., Cecconi, M., Cosentino, R., Ghedina, A., Gonzalez, M., Lodi, M., López-Morales, M., Sozzetti, A., Walsworth, R. L.
Publikováno v:
The Astrophysical Journal, Volume 920, Number 1, 2021
State of the art radial velocity (RV) exoplanet searches are limited by the effects of stellar magnetic activity. Magnetically active spots, plage, and network regions each have different impacts on the observed spectral lines, and therefore on the a
Externí odkaz:
http://arxiv.org/abs/2105.09113
Autor:
Brajsa, R., Skokic, I., Sudar, D., Benz, A. O., Krucker, S., Ludwig, H. -G., Saar, S. H., Selhorst, C. L.
Publikováno v:
A&A 651, A6 (2021)
Aims. The main aim of the present analysis is to decipher (i) the small-scale bright features in solar images of the quiet Sun and active regions obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) and (ii) the ALMA correspondence o
Externí odkaz:
http://arxiv.org/abs/2105.03644
Autor:
Langellier, N., Milbourne, T. W., Phillips, D. F., Haywood, R. D., Saar, S. H., Mortier, A., Malavolta, L., Thompson, S., Cameron, A. Collier, Dumusque, X., Cegla, H. M., Latham, D. W., Maldonado, J., Watson, C. A., Buchschacher, N., Cecconi, M., Charbonneau, D., Cosentino, R., Ghedina, A., Gonzalez, M., Li, C-H., Lodi, M., López-Morales, M., Micela, G., Molinari, E., Pepe, F., Poretti, E., Rice, K., Sasselov, D., Sozzetti, A., Udry, S., Walsworth, R. L.
Publikováno v:
AJ 161 287 (2021)
Radial velocity (RV) searches for Earth-mass exoplanets in the habitable zone around Sun-like stars are limited by the effects of stellar variability on the host star. In particular, suppression of convective blueshift and brightness inhomogeneities
Externí odkaz:
http://arxiv.org/abs/2008.05970
Autor:
Haywood, R. D., Milbourne, T. W., Saar, S. H., Mortier, A., Phillips, D., Charbonneau, D., Cameron, A. Collier, Cegla, H. M., Meunier, N., Palumbo III, M. L.
We estimate disc-averaged RV variations of the Sun over the last magnetic cycle, from the single Fe I line observed by SDO/HMI, using a physical model for rotationally modulated magnetic activity that was previously validated against HARPS-N solar ob
Externí odkaz:
http://arxiv.org/abs/2005.13386
Autor:
Thompson, A. P. G., Watson, C. A., Haywood, R. D., Costes, J. C., de Mooij, E., Cameron, A. Collier, Dumusque, X., Phillips, D. F., Saar, S. H., Mortier, A., Milbourne, T. W., Aigrain, S., Cegla, H. M., Charbonneau, D., Cosentino, R., Ghedina, A., Latham, D. W., López-Morales, M., Micela, G., Molinari, E., Poretti, E., Sozzetti, A., Thompson, S., Walsworth, R.
Stellar activity is the major roadblock on the path to finding true Earth-analogue planets with the Doppler technique. Thus, identifying new indicators that better trace magnetic activity (i.e. faculae and spots) is crucial to aid in disentangling th
Externí odkaz:
http://arxiv.org/abs/2004.09830
Autor:
Miklos, M., Milbourne, T. W., Haywood, R. D., Phillips, D. F., Saar, S. H., Meunier, N., Cegla, H. M., Dumusque, X., Langellier, N., Maldonado, J., Malavolta, L., Mortier, A., Thompson, S., Watson, C. A., Cecconi, M., Cosentino, R., Ghedina, A., Li, C-H., López-Morales, M., Molinari, E., Poretti, E., Sasselov, D., Sozzetti, A., Walsworth, R. L.
Publikováno v:
The Astrophysical Journal, 888:117(6pp), 2020
Efforts to detect low-mass exoplanets using stellar radial velocities (RVs) are currently limited by magnetic photospheric activity. Suppression of convective blueshift is the dominant magnetic contribution to RV variability in low-activity Sun-like
Externí odkaz:
http://arxiv.org/abs/1910.09038