DrYvonneUnruh

Ermolli I, Matthes K, de Wit TD, Krivova NA, Tourpali K, Weber M, Unruh YC, Gray L, Langematz U, Pilewskie P, Rozanov E, Schmutz W, Shapiro A, Solanki SK, Woods TNet 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, Ball WT, Unruh YC, Haigh JD, Krivova NA, Solanki SK, Smith AKet al., 2013, Stratospheric O₃ 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, Solanki S, Wenzler T, Mortlock DJ, Jaffe AHet 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, Bouvier J, Hussain G, Skelly M, Dougados C, Jardine MM, Menard F, Romanova MM, Unruh YCet 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, Solanki S, Harder JWet 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, Schuessler M, Lagg A, Vogler Aet 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, Gregory SG, Grankin KN, Jardine MM, GAJ H, Ménard F, Dougados C, Unruh Y, Mohanty S, Aurière M, Morin J, Farès Ret 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

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Hirzberger J, Feller A, Riethmueller TL, Schuessler M, Borrero JM, Afram N, Unruh YC, Berdyugina SV, Gandorfer A, Solanki SK, Barthol P, Bonet JA, Martinez Pillet V, Berkefeld T, Knoelker M, Schmidt W, Title AMet 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, Grankin KN, Unruh YC, Artemenko SA, Petrov Pet 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, Jardine MM, Gregory SG, Morin J, GAJ H, Dougados C, Ménard F, Unruh Yet 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

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Sale SE, Drew JE, Knigge C, Zijlstra AA, Irwin MJ, Morris RAH, Phillipps S, Drake JJ, Greimel R, Unruh YC, Groot PJ, Mampaso A, Walton NAet 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, Drew JE, Rodriguez-Flores ER, Viironen K, Greimel R, Santander-Garcia M, Sabin L, Mampaso A, Parker Q, De Pew K, Sale SE, Unruh YC, Vink JS, Rodriguez-Gil P, Barlow MJ, Lennon DJ, Groot PJ, Giammanco C, Zijlstra AA, Walton NAet 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, Schuessler M, Mathew SKet 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

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Hales AS, Barlow MJ, Drew JE, Unruh YC, Greimel R, Irwin MJ, Gonzalez-Solares Eet 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

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Wright NJ, Barlow MJ, Greimel R, Drew JE, Matsuura M, Unruh YC, Zijlstra AAet 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, Lawson WA, Donati J-F, Cameron ACet 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, Irwin M, González-Solares E, Gänsicke BT, de GE, Drew J, Augusteijn T, Aungwerojwit A, Barlow M, Barros S, EJM VDB, Casares J, Corradi R, Corral-Santana JM, Deacon N, van HW, Hu H, Heber U, Jonker PG, King R, Knigge C, Mampaso A, Marsh TR, Morales-Rueda L, Napiwotzki R, Naylor T, Nelemans G, Oosting T, Pyrzas S, Pretorius M, Rodríguez-Gil P, GHA R, Sale S, Schellart P, Steeghs D, Szyszka C, Unruh Y, Walton NA, Weston S, Witham A, Woudt P, Zijlstra Aet al., 2009, The UV-Excess survey of the northern Galactic plane, MON NOT R ASTRON SOC, Vol: 399, Pages: 323-339

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Domingo V, Ermolli I, Fox P, Fröhlich C, Haberreiter M, Krivova N, Kopp G, Schmutz W, Solanki SK, Spruit HC, Unruh Y, Vögler Aet 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

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Viironen K, Mampaso A, RLM C, Rodríguez M, Greimel R, Sabin L, Sale SE, Unruh Y, Delgado-Inglada G, Drew JE, Giammanco C, Groot P, Parker QA, Sokoloski J, Zijlstra Aet al., 2009, New young planetary nebulae in IPHAS, ASTRON ASTROPHYS, Vol: 502, Pages: 113-129

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Hales AS, Barlow MJ, Drew JE, Unruh YC, Greimel R, Irwin MJ, Gonzalez-Solares Eet 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, Solano E, Drew JE, Greimel R, Gutierrez R, Unruh YC, Vink JSet 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, Irwin MJ, Knigge C, Phillipps S, Zijlstra AA, GAnsicke BT, Greimel R, Groot PJ, Mampaso A, Morris RAH, Napiwotzki R, Steeghs D, Walton NAet 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, Voegler A, Garcia-Alvarez Det 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, Drew JE, Cioni M-RL, Zijlstra AA, Corradi RLM, Gonzalez-Solares EA, Groot P, Irwin J, Irwin MJ, Mampaso A, Morris RAH, Steeghs D, Unruh YC, Walton Net 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, Drew JE, Irwin MJ, Sale SE, Andrews K, Aungwerojwit A, Barlow MJ, van den Besselaar E, Corradi RLM, Gansicke BT, Groot PJ, Hales AS, Hopewell EC, Hu H, Irwin J, Knigge C, Lagadec E, Leisy P, Lewis JR, Mampaso A, Matsuura M, Moont B, Morales-Rueda L, Morris RAH, Naylor T, Parker QA, Prema P, Pyrzas S, Rixon GT, Rodriguez-Gil P, Roelofs G, Sabin L, Skillen I, Suso J, Tata R, Viironen K, Vink JS, Witham A, Wright NJ, Zijlstra AA, Zurita A, Drake J, Fabregat J, Lennon DJ, Lucas PW, Martin EL, Phillipps S, Steeghs D, Unruh YCet 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, Harder JW, Kopp Get 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, Barnes JR, Donati J-F, Lawson WA, Carter BDet 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, Petit P, Paletou F, Bouvier J, Dougados C, Menard F, Cameron AC, Harries TJ, Hussain GAJ, Unruh Y, Morin J, Marsden SC, Manset N, Auriere M, Catala C, Alecian Eet 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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