Publications
95 results found
Ermolli I, Matthes K, de Wit TD, et al., 2013, Recent variability of the solar spectral irradiance and its impact on climate modelling, ATMOSPHERIC CHEMISTRY AND PHYSICS, Vol: 13, Pages: 3945-3977, ISSN: 1680-7316
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- Citations: 233
Dhomse SS, Chipperfield MP, Feng W, et al., 2013, Stratospheric O<sub>3</sub> changes during 2001-2010: the small role of solar flux variations in a chemical transport model, ATMOSPHERIC CHEMISTRY AND PHYSICS, Vol: 13, Pages: 10113-10123, ISSN: 1680-7316
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- Citations: 21
Unruh YC, Ball WT, Krivova NA, 2012, Solar Irradiance Models and Measurements: A Comparison in the 220-240 nm wavelength band, SURVEYS IN GEOPHYSICS, Vol: 33, Pages: 475-481, ISSN: 0169-3298
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- Citations: 15
Ball WT, Unruh YC, Krivova NA, et al., 2012, Reconstruction of total solar irradiance 1974-2009, ASTRONOMY & ASTROPHYSICS, Vol: 541, ISSN: 1432-0746
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- Citations: 84
Donati J-F, Gregory SG, Alencar SHP, et al., 2011, The large-scale magnetic field and poleward mass accretion of the classical T Tauri star TW Hya, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 417, Pages: 472-487, ISSN: 0035-8711
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- Citations: 83
Ball WT, Unruh YC, Krivova NA, et al., 2011, Solar irradiance variability: a six-year comparison between SORCE observations and the SATIRE model, ASTRONOMY & ASTROPHYSICS, Vol: 530, ISSN: 0004-6361
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- Citations: 53
Afram N, Unruh YC, Solanki SK, et al., 2011, Intensity contrast from MHD simulations and HINODE observations, ASTRONOMY & ASTROPHYSICS, Vol: 526, ISSN: 0004-6361
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- Citations: 20
Krivova NA, Solanki SK, Unruh YC, 2011, Towards a long-term record of solar total and spectral irradiance, JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, Vol: 73, Pages: 223-234, ISSN: 1364-6826
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- Citations: 69
Donati J, Skelly MB, Bouvier J, et al., 2010, Magnetospheric accretion and spin-down of the prototypical classical T Tauri star AA Tau, MON NOT R ASTRON SOC, Vol: 409, Pages: 1347-1361
Hirzberger J, Feller A, Riethmueller TL, et al., 2010, QUIET-SUN INTENSITY CONTRASTS IN THE NEAR-ULTRAVIOLET AS MEASURED FROM SUNRISE, ASTROPHYSICAL JOURNAL LETTERS, Vol: 723, Pages: L154-L158, ISSN: 2041-8205
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- Citations: 33
Skelly MB, Donati J-F, Bouvier J, et al., 2010, Dynamo processes in the T Tauri star V410 Tau, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 403, Pages: 159-169, ISSN: 0035-8711
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- Citations: 40
Donati J, Skelly MB, Bouvier J, et al., 2010, Complex magnetic topology and strong differential rotation on the low-mass T Tauri star V2247 Oph, MON NOT R ASTRON SOC, Vol: 402, Pages: 1426-1436
Sale SE, Drew JE, Knigge C, et al., 2010, The structure of the outer Galactic disc as revealed by IPHAS early A stars, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 402, Pages: 713-723, ISSN: 0035-8711
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- Citations: 31
Corradi RLM, Valentini M, Munari U, et al., 2010, IPHAS and the symbiotic stars II. New discoveries and a sample of the most common mimics, ASTRONOMY & ASTROPHYSICS, Vol: 509, ISSN: 0004-6361
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- Citations: 43
Afram N, Unruh YC, Solanki SK, et al., 2010, A comparison of measured and simulated solar network contrast, 264th Symposium of the International-Astronomical-Union, Publisher: CAMBRIDGE UNIV PRESS, Pages: 63-+, ISSN: 1743-9213
Hales AS, Barlow MJ, Drew JE, et al., 2010, IPHAS A-type Stars with Mid-IR Excesses in Spitzer Surveys, 27th IAU General Assembly, Publisher: CAMBRIDGE UNIV PRESS, Pages: 815-815, ISSN: 1743-9213
Wright NJ, Barlow MJ, Greimel R, et al., 2009, Near-IR spectra of IPHAS extremely red Galactic AGB stars, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 400, Pages: 1413-1426, ISSN: 0035-8711
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- Citations: 12
Skelly MB, Unruh YC, Barnes JR, et al., 2009, Doppler images and chromospheric variability of TWA 17, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 399, Pages: 1829-1838, ISSN: 0035-8711
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- Citations: 14
Groot PJ, Verbeek K, Greimel R, et al., 2009, The UV-Excess survey of the northern Galactic plane, MON NOT R ASTRON SOC, Vol: 399, Pages: 323-339
Domingo V, Ermolli I, Fox P, et al., 2009, Solar Surface Magnetism and Irradiance on Time Scales from Days to the 11-Year Cycle, SPACE SCIENCE REV, Vol: 145, Pages: 337-380
Viironen K, Mampaso A, RLM C, et al., 2009, New young planetary nebulae in IPHAS, ASTRON ASTROPHYS, Vol: 502, Pages: 113-129
Hales AS, Barlow MJ, Drew JE, et al., 2009, IPHAS A-TYPE STARS WITH MID-INFRARED EXCESSES IN <i>SPITZER</i> SURVEYS, ASTROPHYSICAL JOURNAL, Vol: 695, Pages: 75-93, ISSN: 0004-637X
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- Citations: 5
Valdivielso L, Martin EL, Bouy H, et al., 2009, An IPHAS-based search for accreting very low-mass objects using VO tools, ASTRONOMY & ASTROPHYSICS, Vol: 497, Pages: 973-981, ISSN: 1432-0746
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- Citations: 13
Sale SE, Drew JE, Unruh YC, et al., 2009, High spatial resolution Galactic 3D extinction mapping with IPHAS, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 392, Pages: 497-513, ISSN: 0035-8711
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- Citations: 58
Unruh YC, Solanki SK, Schuessler M, et al., 2009, Towards Long-Term Solar Irradiance Modelling: Network Contrasts from Magneto-Convection Simulations, 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, Publisher: AMER INST PHYSICS, Pages: 768-+, ISSN: 0094-243X
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- Citations: 6
Wright NJ, Greimel R, Barlow MJ, et al., 2008, Extremely red stellar objects revealed by IPHAS, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 390, Pages: 929-944, ISSN: 0035-8711
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- Citations: 15
Gonzalez-Solares EA, Walton NA, Greimel R, et al., 2008, Initial data release from the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS), MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 388, Pages: 89-104, ISSN: 0035-8711
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- Citations: 89
Unruh YC, Krivova NA, Solanki SK, et al., 2008, Spectral irradiance variations: comparison between observations and the SATIRE model on solar rotation time scales, ASTRONOMY & ASTROPHYSICS, Vol: 486, Pages: 311-323, ISSN: 1432-0746
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- Citations: 42
Skelly MB, Unruh YC, Cameron AC, et al., 2008, Doppler images and chromospheric variability of TWA 6, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 385, Pages: 708-718, ISSN: 0035-8711
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- Citations: 42
Donati J-F, Jardine MM, Gregory SG, et al., 2008, Magnetospheric accretion on the T Tauri star BP Tauri, Mon Not R Astron Soc, Vol: 386, Pages: 1234-1251
From observations collected with the ESPaDOnS and NARVAL spectropolarimeters, we report the detection of Zeeman signatures on the classical T Tauri star (cTTS) BP Tau. Circular polarization signatures in photospheric lines and in narrow emission lines tracing magnetospheric accretion are monitored throughout most of the rotation cycle of BP Tau at two different epochs in 2006. We observe that rotational modulation dominates the temporal variations of both unpolarized and circularly polarized spectral proxies tracing the photosphere and the footpoints of accretion funnels. From the complete data sets at each epoch, we reconstruct the large-scale magnetic topology and the location of accretion spots at the surface of BP Tau using tomographic imaging. We find that the field of BP Tau involves a 1.2 kG dipole and 1.6 kG octupole, both slightly tilted with respect to the rotation axis. Accretion spots coincide with the two main magnetic poles at high latitudes and overlap with dark photospheric spots; they cover about 2 per cent of the stellar surface. The strong mainly axisymmetric poloidal field of BP Tau is very reminiscent of magnetic topologies of fully convective dwarfs. It suggests that magnetic fields of fully convective cTTSs such as BP Tau are likely not fossil remants, but rather result from vigorous dynamo action operating within the bulk of their convective zones. Preliminary modelling suggests that the magnetosphere of BP Tau extends to distances of at least 4R* to ensure that accretion spots are located at high latitudes, and is not blown open close to the surface by a putative stellar wind. It apparently succeeds in coupling to the accretion disc as far out as the corotation radius, and could possibly explain the slow rotation of BP Tau. Based on observations obtained at the Canada-France-Hawaii Telescope (CFHT) and at the Télescope Bernard Lyot (TBL). CFHT is operated by the National Research Council of Canada, the Institut National des S
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