Button crowns Brawn GP's fairytale
Brawn GP have become the first Formula 1 team to win the constructors' championship in their debut season.
Jenson Button sealed the drivers' championship with a fifth-placed finish while Rubens Barrichello was eighth.
It concludes a fairytale year for the team, whose existence was not confirmed until three weeks before the season.
Team boss Ross Brawn said: "The world caved in over the winter. It has been a real roller-coaster and to end up where we've ended up is fantastic."
The Brawn team was formed out of the ashes of the former Honda outfit after the Japanese car giant pulled out of F1 last December as a result of the global financial crisis.
Brawn tearful after 'special' title win
Brawn spent the winter looking for a buyer and engineered an 11th-hour management buy-out, aided by financial help from Honda and support from engine supplier Mercedes-Benz, to secure his outfit's future.
The 54-year-old Englishman, who has previously won world titles with Benetton and Ferrari, broke down in tears after the Brazilian Grand Prix when asked for his reaction.
"It's still got to sink in," Brawn told BBC Sport. "It's still going to take a while.
"Very special. The world caved in over the winter and my thanks goes out to all the people who couldn't be with us because we had to re-size the team.
"They worked over the winter and they had to leave. I hope they've enjoyed what they've achieved because they've been part of what we've done.
BRAWN GP FACTS AND STATS
Headquarters Brackley, UK
Debut season 2009
Team principal: Ross Brawn
Technical director: Jorg Zander
Engine: Mercedes V8
Brawn dominated the start of the season, with Button winning six of the first seven races, and they found themselves caught in a controversy over the design of their car's rear diffuser, which several rivals said contravened the rules.
The part, a critical influence on aerodynamics at the rear of the car was declared legal, after which all the other teams copied it.
Brawn's advantage was gradually eroded and the team have struggled since June as other teams have overtaken them for pace.
"It's made it hard, the second half of the year," Brawn said. "We've lost a bit of pace in the car over the last few races but he's stuck with it and he's deserved everything he's got."
Brawn, whose car is powered by a Mercedes engine, needed half a point to wrap up the title in Brazil, ahead of closest rivals Red Bull, and they picked up five.
As technical director, Ross Brawn masterminded six consecutive championships for Ferrari between 1999-2004 to add to the constructor crown he won with Benetton in 1995.
The 54-year-old has now achieved success as a team principal with his eponymous team.
The team championship was introduced in 1958, which is why Alfa Romeo (winners of the 1950 title with Alberto Ascari) and Mercedes-Benz (winners in 1954 with Juan Manuel Fangio) are not classed as debut winners.
In 1971, Tyrrell claimed the championship in their first full season but had introduced their cars during the previous season.
Brawn said he was confident the team would be able to build on this year in 2010.
"We've got a good budget for next year," he said. "The finance is in place for next season, we started next year's car quite a long time ago.
"It will be tough. We won't have the advantage we enjoyed at the start of this year this season with, but there's so much confidence in the team, it's going to make a big difference.
"I'm quietly confident. We're going to be respectable, for sure."