5,213 research outputs found
The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc
No full textWe report the discovery of a multiplanetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists of at least two transiting planets, namely HD 260655 b, with a period of 2.77 d, a radius of
R
b
= 1.240 ± 0.023
R
⊕
, a mass of
M
b
= 2.14 ± 0.34
M
⊕
, and a bulk density of
ρ
b
= 6.2 ± 1.0 g cm
−3
, and HD 260655 c, with a period of 5.71 d, a radius of , a mass of
M
c
= 3.09 ± 0.48
M
⊕
, and a bulk density of g cm
−3
. The planets have been detected in transit by the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed independently with archival and new precise radial velocities obtained with the HIRES and CARMENES instruments since 1998 and 2016, respectively. At a distance of 10 pc, HD 260655 has become the fourth closest known multitransiting planet system after HD 219134, LTT 1445 A, and AU Mic. Due to the apparent brightness of the host star (
J
= 6.7 mag), both planets are among the most suitable rocky worlds known today for atmospheric studies with the
James Webb
Space Telescope, both in transmission and emission
Análisis descriptivo del proceso de desmonte y habilitación de tierras en el Chaco Argentina
Get PDFLa República Argentina, aún con las discontinuidades institucionales y altibajos de un país en vías de desarrollo, ha logrado crear y mantener estructuras institucionales reguladoras del patrimonio ambiental a todos los niveles de la administración pública (Morello y Rodríguez, 2007). Hacia fines del siglo xx, los eventos vinculados con el ambiente más relevante a nivel nacional y regional habían sido: a) la creación, entre 1950 y 1975 de grupos de trabajo en ambiente acuático y terrestre auspiciados y financiados por CONICET, INTA y las Univ. Nacionales; b) El creciente interés en el Gran Buenos Aires monitoreo de la contaminación aérea en áreas industriales (partidos Avellaneda, Lanús, Quilmes, La Matanza); c) la elaboración de propuestas de desarrollo sostenible en zonas áridas elaborados por grupos técnico-científicos del INTA y por lo menos 4 universidades: Bahía Blanca, La Pampa, Comahue y Cuyo; d) manejo de sobrepastoreo e incendios en ambiente serrano, Univ. de Córdoba, Univ. de Santiago del Estero; e) análisis de ambiente humano (Fundación Bariloche y desde 1972 la Secretaria de Ambiente y Desarrollo Sustentable (en adelante SAyDS); f) climatología ambiental (SMN, INTA, SAyDS, UBA); g) degradación de ambientes de bosques nativos (Univ. de Córdoba, UNLP, Univ. Misiones, Univ. Tucumán, Instituto Forestal Nacional); h) ambientes agroproductivos y agroecología (UNCO, UBA, Univ. de Cuyo y fundamentalmente INTA); i) ambiente urbano (UNNE, FADU-UBA, Univ. Rosario); j) ambiente de pastizales y arbustales (UBA, Univ. Río Cuarto, INTA, Univ. de Córdoba, Univ. de La Pampa, Univ. de Bahía Blanca); k) ambientes protegidos para conservación de la biodiversidad APN, INTA, SAyDS, Univ. de Cuyo, gobiernos provinciales en especial Santiago del Estero, San Juan y Chubut; l) ambientes de bosque nativo y plantaciones de exóticas (Univ. Comahue, APN); m) restauración de ambientes naturales y seminaturales (APN, UNLP, Univ. de Comahue, Univ. de Córdoba, Univ. Cuyo; Univ. de Tucumán); n) ordenamiento territorial y planificación ambiental, (UNNE, UBA, Univ. de Tucumán); o) estudio y control de procesos erosivos periurbanos y rurales (INTA, APN, UBA, Univ. de Bahía Blanca)...Fil: Morello, Jorge Helios. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Arquitectura y Urbanismo. Grupo de Ecología del Paisaje y Medio Ambiente; ArgentinaFil: Rodriguez, Andrea Fernanda. Universidad de Buenos Aires. Facultad de Arquitectura y Urbanismo. Grupo de Ecología del Paisaje y Medio Ambiente; ArgentinaFil: Pengue, Walter Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Arquitectura y Urbanismo. Grupo de Ecología del Paisaje y Medio Ambiente; Argentina. Universidad Nacional de General Sarmiento; Argentin
Double-J ureteral stenting in nine cats with ureteral obstruction
No full textUreteral stenting is a common practice in human medicine and has recently been reported in dogs and
cats to provide urinary diversion for ureteral obstructions caused by ureteroliths, strictures, neoplasia,
and in an attempt to prevent postoperative complications following ureteral anastomosis. The aim of this
report is to describe a surgical technique of ureteral stenting and the follow-up and complications in nine
cats.
Number 3 French double-J catheters were used during open surgery for ureterotomy/ureterolith
removal in eight cats and for segmental ureterectomy/end-to-end anastomosis in one cat for a localized
benign stricture. Neoureterocystostomy was necessary in eight of the cats. Uroperitoneum did not occur.
Stents were still in place in 7/9 animals after 357–1565 days (median 1277 days). A minor complication
(stent migration) occurred in one cat, but stent removal was not required. Major complications were
encrustation and persistent stranguria (in one cat each), requiring stent removal at 90 and 123 days,
respectively. The first cat had a new stent inserted but was euthanased 3 months later for progressive
renal failure. Despite the small number of cats, both the outcome and long-term stent tolerance observed
in most cases suggest that ureteral stenting is a safe, adjunctive measure to ureteral surgery, mainly for
concomitant ureteral and renal pelvic stones to prevent further obstruction and avoid pyelotomy/
nephrotomy. However, smaller stents should be used to decrease the need for ureteral surger
Double-J ureteral stenting in nine cats with ureteral obstruction
Get PDFUreteral stenting is a common practice in human medicine and has recently been reported in dogs and cats to provide urinary diversion for ureteral obstructions caused by ureteroliths, strictures, neoplasia, and in an attempt to prevent postoperative complications following ureteral anastomosis. The aim of this report is to describe a surgical technique of ureteral stenting and the follow-up and complications in nine cats.
Number 3 French double-J catheters were used during open surgery for ureterotomy/ureterolith removal in eight cats and for segmental ureterectomy/end-to-end anastomosis in one cat for a localized benign stricture. Neoureterocystostomy was necessary in eight of the cats. Uroperitoneum did not occur. Stents were still in place in 7/9 animals after 357–1565 days (median 1277). A minor complication (stent migration) occurred in one cat, but stent removal was not required. Major complications were encrustation and persistent stranguria (in one cat each), requiring stent removal at 90 and 123 days, respectively. The first cat had a new stent inserted but was euthanased 3 months later for progressive renal failure. Despite the small number of cats, both the outcome and long-term stent tolerance observed in most cases suggest that ureteral stenting is a safe, adjunctive measure to ureteral surgery, mainly for concomitant
ureteral and renal pelvic stones to prevent further obstruction and avoid pyelotomy/nephrotomy. However, smaller stents should be used to decrease the need for ureteral surgery
GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth
No full textOne of the main scientific goals of the TESS mission is the discovery of transiting small planets around the closest and brightest stars in the sky. Here, using data from the CARMENES, MAROON-X, and HIRES spectrographs together with TESS, we report the discovery and mass determination of aplanetary system around the M1.5 V star GJ 806 (TOI-4481). GJ 806 is a bright ( V ≈ 10.8mag, J ≈ 7.3 mag) and nearby ( d = 12 pc) M dwarf that hosts at least two planets. The innermost planet, GJ 806 b, is transiting and has an ultra-short orbital period of 0.93 d, a radius of 1.331 ± 0.023 R ⊕ , a mass of 1.90 ± 0.17 M ⊕ , a mean density of 4.40 ± 0.45 g cm −3 , and an equilibrium temperature of 940 ± 10 K. We detect a second, non-transiting, super-Earth planet in the system, GJ 806 c, with an orbital period of 6.6 d, a minimum mass of 5.80 ± 0.30 M ⊕ , and an equilibrium temperature of 490 ± 5 K. The radial velocity data also shows evidence for a third periodicity at 13.6 d, although the current dataset does not provide sufficient evidence to unambiguously distinguish between a third super-Earth mass ( M sin i = 8.50 ± 0.45 M ⊕ ) planet or stellar activity. Additionally, we report one transit observation of GJ 806 b taken with CARMENES in search of a possible extended atmosphere of H or He, but we can only place upper limits to its existence. This is not surprising as our evolutionary models support the idea that any possible primordial H/He atmosphere that GJ 806 b might have had would be long lost. However, the bulk density of GJ 806 b makes it likely that the planet hosts some type of volatile atmosphere. With transmission spectroscopy metrics (TSM) of 44 and emission spectroscopy metrics (ESM) of 24, GJ 806 b is to date the third-ranked terrestrial planet around an M dwarf suitable for transmission spectroscopy studies using JWST, and the most promising terrestrial planet for emission spectroscopy studies. GJ 806b is also an excellent target for the detection of radio emission via star-planet interactions
Observations of Bºs→ψ(2S)η and Bº(s)→ψ(2S)π+π- decays
Get PDFFirst observations of the B0s
→ψ(2S)η, B0 →ψ(2S)π
+
π
− and B0s
→ψ(2S)π
+
π
− decays are made
using a dataset corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in
proton–proton collisions at a centre-of-mass energy of
√
s = 7 TeV. The ratios of the branching fractions
of each of the ψ(2S) modes with respect to the corresponding J/ψ decays are
B(B0s
→ψ(2S)η)
÷
B(B0s
→J/ψη)
= 0.83± 0.14 (stat)±0.12 (syst) ±0.02 (B),
;
B(B0→ψ(2S)π
+
π
−
)
÷
B(B0→J/ψπ
+
π
−
)
= 0.56± 0.07 (stat)±0.05 (syst)± 0.01 (B),
;
B(B0s
→ψ(2S)π
+
π
−
)
÷
B(B0s
→J/ψπ
+
π
−
)
= 0.34± 0.04 (stat)±0.03 (syst)± 0.01 (B),
where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the J/ψ
and ψ(2S) meson decays
Precise mass determination for the keystone sub-Neptune planet transiting the mid-type M dwarf G 9-40
No full textContext.
Despite being a prominent subset of the exoplanet population discovered in the past three decades, the nature and provenance of sub-Neptune-sized planets is still one of the open questions in exoplanet science.
Aims.
For planets orbiting bright stars, precisely measuring the orbital and planet parameters of the system is the best approach to distinguish between competing theories regarding their formation and evolution.
Methods.
We obtained 69 new radial velocity observations of the mid-M dwarf G 9–40 with the CARMENES instrument to measure for the first time the mass of its transiting sub-Neptune planet, G 9–40 b, discovered in data from the K2 mission.
Results.
Combined with new observations from the TESS mission during Sectors 44, 45, and 46, we are able to measure the radius of the planet to an uncertainty of 3.4% (
R
b
= 1.900 ± 0.065
R
⊕
) and determine its mass with a precision of 16% (
M
b
= 4.00 ± 0.63
M
⊕
). The resulting bulk density of the planet is inconsistent with a terrestrial composition and suggests the presence of either a water-rich core or a significant hydrogen-rich envelope.
Conclusions.
G 9–40 b is referred to as a keystone planet due to its location in period-radius space within the radius valley. Several theories offer explanations for the origin and properties of this population and this planet is a valuable target for testing the dependence of those models on stellar host mass. By virtue of its brightness and small size of the host, it joins L 98-59 d as one of the two best warm (
T
eq
~ 400 K) sub-Neptunes for atmospheric characterization with JWST, which will probe cloud formation in sub-Neptune-sized planets and break the degeneracies of internal composition models
Real-time cluster finding for LHCb silicon pixel VELO detector using FPGA
Get PDFIn the Run-3 of LHCb, the High Level Trigger will have to process events at full LHC collision rate (30 MHz). This is a very challenging goal, and delegating some low-level tasks to FPGA accelerators can be very helpful by saving precious computing time. In particular, the 2D pixel geometry of the new LHCb VELO detector makes the cluster-finding process particularly CPU-time demanding. We realized and tested a highly parallel FPGA-based clustering algorithm, capable of performing this reconstruction in real time at 30 MHz event rate using a modest amount of hardware resources, that can be a viable alternative solution
Near-surface air temperature maps at 30-m spatial resolution for the Sixth of October new desert city, Egypt
No full textModelled near-surface air temperature maps at 30-m spatial resolution for the Sixth of October new desert city, Egypt.The maps are in GeoTIFF format and can be visualized and analyzed using Geographic Information Systems (GIS) packages. The maps are for the following days:2 September 2020 (19:00 LT)29 September 2020 (14:30 LT)30 September 2020 (13:30 LT)30 September 2020 (19:30 LT)Please refer to and cite the following article when using these maps:Eldesoky, A.H.M., Colaninno, N., Morello, E., 2021. High-resolution air temperature mapping in a data-scarce, arid area by means of low-cost mobile measurements and machine learning. J Phys Conf Ser 2042, 012045. https://doi.org/10.1088/1742-6596/2042/1/012045<br
- …
