Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Doyle, J Gerry"'
Publikováno v:
A&A 689, A288 (2024)
We have searched for stellar activity cycles in late low mass M dwarfs (M0--M6) located in the TESS north and south continuous viewing zones using data from sectors 1--61 (Cycle 1 to part way through Cycle 5). We utilise TESS-SPOC data which initiall
Externí odkaz:
http://arxiv.org/abs/2407.07607
New instrumental and telescopes covering the optical and ultra-violet spectral regions have revealed a range of small-scale dynamic features, many which may be related. For example, the range of spicule-like features hints towards a spectrum of featu
Externí odkaz:
http://arxiv.org/abs/2306.02945
We show signatures of spicules termed Rapid Blue-shifted Excursions (RBEs) in the Si iv 1394 {\AA} emission line using a semi-automated detection approach. We use the H{\alpha} filtergrams obtained by the CRISP imaging spectropolarimeter on the Swedi
Externí odkaz:
http://arxiv.org/abs/2207.01415
Autor:
Rigney, Jeremy, Ramsay, Gavin, Carley, Eoin P., Doyle, J. Gerry, Gallagher, Peter T., Wang, Yuanming, Pritchard, Joshua, Murphy, Tara, Lenc, Emil, Kaplan, David L.
Solar radio emission at low frequencies (<1 GHz) can provide valuable information on processes driving flares and coronal mass ejections (CMEs). Radio emission has been detected from active M dwarf stars, suggestive of much higher levels of activity
Externí odkaz:
http://arxiv.org/abs/2207.00405
Autor:
Doyle, J. Gerry, Irawati, Puji, Kolotkov, Dmitrii Y., Ramsay, Gavin, Nhalil, Nived Vilangot, Dhillon, Vik S., Marsh, Tom R., Yadav, Ram Kesh
Using the ULTRASPEC instrument mounted on the 2.4-m Thai National Telescope, we observed two large flares, each with a total energy close to 10^34 erg with sub-second cadence. A combination of a wavelet analysis, a Fourier transform plus an empirical
Externí odkaz:
http://arxiv.org/abs/2206.08070
Observations made using TESS revealed a sample of low mass stars which show a periodic modulation on a period $<0.2$~d. Surprisingly many of these Ultra Fast Rotating (UFR) stars showed no evidence of flare activity which would be expected from such
Externí odkaz:
http://arxiv.org/abs/2202.06888
We have performed a search for flares and Quasi-Periodic Pulsations (QPPs) from low mass M dwarf stars using TESS 2 min cadence data. We find seven stars which show evidence of QPPs. Using Fourier and Empirical Mode Decomposition techniques, we confi
Externí odkaz:
http://arxiv.org/abs/2108.10670
Autor:
Murphy, Tara, Kaplan, David L., Stewart, Adam J., O'Brien, Andrew, Lenc, Emil, Pintaldi, Sergio, Pritchard, Joshua, Dobie, Dougal, Fox, Archibald, Leung, James K., An, Tao, Bell, Martin E., Broderick, Jess W., Chatterjee, Shami, Dai, Shi, d'Antonio, Daniele, Doyle, J. Gerry, Gaensler, B. M., Heald, George, Horesh, Assaf, Jones, Megan L., McConnell, David, Moss, Vanessa A., Raja, Wasim, Ramsay, Gavin, Ryder, Stuart, Sadler, Elaine M., Sivakoff, Gregory R., Wang, Yuanming, Wang, Ziteng, Wheatland, Michael S., Whiting, Matthew, Allison, James R., Anderson, C. S., Ball, Lewis, Bannister, K., Bock, D. C. -J., Bolton, R., Bunton, J. D., Chekkala, R., Chippendale, A. P., Cooray, F. R., Gupta, N., Hayman, D. B., Jeganathan, K., Koribalski, B., Lee-Waddell, K., Mahony, Elizabeth K., Marvil, J., McClure-Griffiths, N. M., Mirtschin, P., Ng, A., Pearce, S., Phillips, C., Voronkov, M. A.
The Variables and Slow Transients Survey (VAST) on the Australian Square Kilometre Array Pathfinder (ASKAP) is designed to detect highly variable and transient radio sources on timescales from 5 seconds to $\sim 5$ years. In this paper, we present th
Externí odkaz:
http://arxiv.org/abs/2108.06039
Autor:
Nhalil, Nived Vilangot, Nelson, Chris J., Mathioudakis, Mihalis, Doyle, J. Gerry, Ramsay, Gavin
Numerous studies have analysed inferred power-law distributions between frequency and energy of impulsive events in the outer solar atmosphere in an attempt to understand the predominant energy supply mechanism in the corona. Here, we apply a burst d
Externí odkaz:
http://arxiv.org/abs/2009.03123
We report on I band photometric observations of 21 stars with spectral types between M8 and L4 made using the Isaac Newton Telescope. The total amount of time for observations which had a cadence of <2.3 mins was 58.5 hrs, with additional data with l
Externí odkaz:
http://arxiv.org/abs/1507.07784