New grad student in the group obtains FAPESP scholarship

Let’s congratulate Artur Vemado─the newest graduate student in the group─who got a prestigious FAPESP scholarship. Artur just graduated with an astronomy degree at USP. His project will consist of incorporating radiative cooling in the energy equation of hot accretion flows, in order to investigate state transitions in black hole binaries.

Postdoctoral position ICTP-SAIFR/USP to join our group

There is a FAPESP postdoctoral position opening for working in our group and collaborating with researchers at ICTP-SAIFR. This position is for a double appointment at USP and ICTP-SAIFR.

Review of applications will begin in January 2018 and will continue until all positions have been filled. Although there is no strict deadline, applications before December 15, 2017 are strongly recommended for positions to begin in 2018.

More information in the website.


Participação de membro do grupo no Jornal Band News

Ontem à noite, participei do Jornal Band News contando a importância da grande descoberta astronômica sobre a colisão das duas estrelas de nêutrons.

Foi um momento histórico, o início da era da astronomia dos multi-mensageiros: observação de ondas gravitacionais e luz vindos de uma mesma fonte astronômica! E a resposta ao mistério da origem dos elementos mais pesados que o ferro da tabela periódica.

Espero que tenha passado os principais aspectos da descoberta, ressaltando a participação de muitos astrônomos no Brasil em vários estados—RN, RJ, SP, SC e SE—e em várias instituições—INPE e UFRN (times do LIGO/VIRGO), e USP, ON, UFRJ, UFSE e UFSC (contrapartida eletromagnética).

Speeding up black hole radiative transfer with GPUs

Today we’ve had the first meeting of the group with the goal of accelerating radiative transfer calculations around black holes with graphical processing units (GPUs). The idea is that by porting the code to exploit the massive parallelism of GPUs, we will see a dramatic speedup (hopefully ~10-100x). We have an enthusiastic group of students!

We decided to proceed with NVIDIA CUDA rather than OpenCL due to the better documentation and more astrophysical examples available in CUDA to guide us.

We will try to have a beta version of the GPU-accelerated code by December, and a release candidate on May 2018. The main challenges–as usual with GPGPU–is writing the appropriate kernels and GPU memory management in order to reduce host-device data transfers as much as possible.

Stay tuned for exciting news on astrophysical high-performance computing by our group!